3 letters:
ata

4 letters:
fata, hata, lata, mata, nata, tata

5 letters:
adata, agata, alata, amata, anata, arata, botta, cdata, chata, cotta, csata, d.f.a, d.n.a, datta, dnata, elata, esata, fatah, fiata, gatta, gdata, gotta, got a, grata, guata, idata, irata, iwata, khata, kotta, lotta, miata, motta, msata, not a, ogata, omata, opata, orata, ovata, piata, plata, potta, prata, quata, riata, rotta, scata, shote, sot a, suata, ta-ta, totta, usata, vrata, wmata, yatta, zlata

6 letters:
adnata, albata, algata, anatta, aratta, arcata, armata, aurata, axiata, barata, batata, bemata, bogata, calata, cerata, chahta, codata, croate, dagata, devata, dolata, donata, emrata, encata, errata, favata, fidata, flauta, flotta, galata, hakata, hatata, hinata, hirata, incata, indata, irdata, janata, jugata, jurata, kalata, kolata, kujata, lafata, latata, licata, lobata, lopata, lunata, lyrata, malata, manata, matata, miyata, mulata, murata, nagata, nakata, napata, nowata, oughta, parata, patata, pedata, pinata, pirata, plot a, rakata, reatta, regata, renata, renate, risata, robata, sabata, sakata, salata, shot a, slot a, socata, somata, sonata, sorata, sovata, sowata, spot a, sumata, takata, tarata, tauto-, tegata, terata, thatta, umtata, vinata, virata, vyatta, yahata, yawata, yazata, yotta-, yukata, zapata, zenata

7 letters:
agliata, anahata, azafata, ballata, baratta, bharata, bingata, biodata, borgata, burrata, cannata, cantata, cascata, cassata, caudata, ciliata, clavata, corbata, cordata, covatta, dinhata, dupatta, ephrata, falcata, fellata, fregata, gaumata, gaviota, granata, gravata, gymkata, harmata, hintata, ingrata, inkatha, juniata, kenyata, kolkata, kuakata, malkata, marotta, mendota, misrata, mocatta, netdata, niigata, obovata, odonata, odorata, passata, piccata, pinnata, primata, prolata, prorata, radiata, regatta, serrata, shibata, sinuata, striata, sulcata, sunyata, thecata, toccata, trijata, trovata, ulonata, unidata, valvata, vanatta, venkata, virgata, vulgata, waratah, xstrata, zuntata

8 letters:
achelata, airavata, al-fatah, allegata, alma-ata, alouatta, anecdata, annulata, athecata, bought a, camarata, cambiata, camelote, camerata, candiote, caponata, carlotta, catarata, caught a, ciabatta, copelata, craniata, cravatta, cristata, crostata, cypriote, digitata, edentata, emerdata, ephratah, facciata, farinata, fought a, frittata, gerulata, giornata, glossata, hirakata, horchata, insalata, jannotta, judicata, kalamata, kawabata, kenyatta, labiatae, la plata, limonata, lipomata, loksatta, loricata, macerata, mahratta, manciata, matamata, metadata, minamata, naginata, nekomata, nevicata, nunziata, occhiata, oedemata, onnagata, parijata, plumbata, pro-rata, prostata, rumchata, samatata, samosata, sasumata, scarlata, serenata, shunyata, sought a, squamata, stigmata, suricata, taeniata, tanabata, taught a, teradata, traviata, uncinata, undulata, ungulata, vagbhata, vannatta, vidhaata, viewdata, wikidata, yamagata, zenyatta, zygomata

9 letters:
adenomata, aggregata, alpargata, alveolata, anawrahta, angiomata, annellata, aranciata, argonauta, aryabhata, avannaata, bangamata, bhagavata, brachiata, brought a, cabalgata, cammarata, cephalata, charulata, chipolata, cingulata, coelomata, consolata, coushatta, deciduata, devadatta, dicyemata, empyemata, fimbriata, fortunata, fulgurata, gaalipata, garrapata, gogoplata, gremolata, imbricata, imbrocata, inamorata, juan mata, koversada, laevigata, marginata, mata-mata, melismata, microdata, neuromata, oblongata, paramatta, plegepoda, prosomata, pulmonata, santagata, scotomata, siphonata, substrata, thought a, thymomata, tushratta, ultra-ata, urocerata, variegata

10 letters:
abbreviata, adjudicata, ambasciata, annunciata, annunziata, asiphonata, astronauta, astronaute, atheromata, barghawata, basilicata, bhagadatta, blastemata, capreolata, chloasmata, cioccolata, clitellata, colobomata, decacerata, dekatriata, desiderata, dinocerata, fastigiata, hanayamata, imbroccata, innominata, kuladevata, lemniscata, lysistrata, magarpatta, mahabarata, marmellata, myocommata, octocerata, oodnadatta, parramatta, perikymata, perisomata, poriferata, rawatbhata, siphoniata, skandamata, sterigmata, syntagmata, tessellata, trifoliata, vesiculata, wangaratta

11 letters:
abranchiata, aerogaviota, awgthtgtata, bambocciata, barracouata, chelicerata, cholpon-ata, coolangatta, derotremata, ferungulata, granulomata, haustellata, inconsolata, leiomyomata, mahabharata, mandibulata, monotremata, passeggiata, phantasmata, pleocyemata, ratamahatta, soppressata, superstrata, t-14 armata, tentaculata, terra cotta, testudinata, treponemata, urochordata, yucca elata

12 letters:
adenomyomata, appassionata, arthropomata, chromonemata, chuquicamata, coelenterata, dibranchiata, hemangiomata, hemichordata, heterosomata, megaloblatta, megumi ogata, meningiomata, notoungulata, paenungulata, piano sonata, preoblongata, prophragmata, takeminakata, taramasalata, taramosalata

13 letters:
appendiculata, astrocytomata, echinodermata, j. r. d. tata, persona grata, plasmodesmata, postoblongata, rhabdomyomata, vishakhadatta

14 letters:
meridiungulata, notobranchiata, nudibranchiata, prosopulmonata, ryota yamagata

15 letters:
cephalochordata, cirrobranchiata, dermobranchiata, dorsibranchiata, gymnophthalmata, hydrobranchiata, mahendraparvata, pellibranchiata, prosobranchiata, prothyalosomata, pulmobranchiata, rio de la plata, scutibranchiata, tectibranchiata, tetrabranchiata, zeugobranchiata

16 letters:
capitibranchiata, cryptobranchiata, dendrobranchiata, inferobranchiata, nucleobranchiata, palliobranchiata, rayderley zapata, tubulibranchiata

17 letters:
lamellibranchiata, opisthobranchiata, pectinibranchiata, perennibranchiata, persona non grata, pulmonibranchiata, siphonobranchiata, steganophthalmata

18 letters:
pheochromocytomata

19 letters:
muscivora-forficata, sarkaru vaari paata

4 letters:
baba, saba, nada, gaga, paca, saga, gaba, papa

5 letters:
sabah, aqaba, abaca, dhaka, osaka, adapa, akaba, bhaga, cauda, chaga, draba, joppa, kokka

6 letters:
armada, quagga, casaba, macaca, lusaka, kawaka, badaga, calaba, gadaba, maraca, pataca

7 letters:
tostada, kannada, grenada, granada, araroba, atakapa, jellaba, kichaga, matoaka, orizaba

8 letters:
moussaka, intifada, ali baba, attacapa, hunkpapa, pinctada, rum baba

9 letters:
pastinaca, portulaca, enchilada, saxifraga, muscicapa, nucifraga, setophaga

10 letters:
jaboticaba, autostrada, tardigrada, chachalaca, crotophaga, mallophaga, notostraca

11 letters:
addis ababa, trichophaga

12 letters:
echidnophaga, entomostraca, malacostraca

13 letters:
sierra nevada, gulf of aqaba, mountain paca

14 letters:
spanish armada

17 letters:
capital of nevada, invincible armada