2 syllables:
-aceous, -acious, aceous, acious, glacious, gracious, spacious, tatius

3 syllables:
araceous, audacious, bardacious, bibacious, bodacious, bowdacious, bulbaceous, byssaceous, cactaceous, capacious, ceraceous, cetaceous, chartaceous, chylaceous, cistaceous, cornaceous, cretaceous, cretacious, crustaceous, curvaceous, dicacious, disgracious, drupaceous, edacious, fabaceous, fagaceous, fallacious, feracious, filaceous, flirtatious, fugacious, fumacious, furacious, gemmaceous, glumaceous, herbaceous, horatius, hordeaceous, ignatius, ingracious, julaceous, juncaceous, lappaceous, lardaceous, lauraceous, lemnaceous, lilaceous, limaceous, linaceous, linguacious, loquacious, lutaceous, lythraceous, malgracious, malvaceous, marlaceous, mendacious, menthaceous, meracious, micaceous, minaceous, misgracious, moraceous, mordacious, musaceous, myrtaceous, nugacious, ostraceous, ostreaceous, palacious, palmaceous, pancratius, pearlaceous, pennaceous, perlaceous, pinaceous, poaceous, pomaceous, porraceous, predaceous, predacious, procacious, psittaceous, pultaceous, rampacious, rapacious, rhamnaceous, rosaceous, rudaceous, rutaceous, sagacious, salacious, schistaceous, schorlaceous, scribacious, scribatious, sebaceous, sequacious, setaceous, shorlaceous, solacious, spathaceous, spinaceous, sporaceous, squamaceous, taxaceous, temptatious, tenacious, testaceous, theaceous, tophaceous, truttaceous, tufaceous, tuffaceous, ulmaceous, umbratious, ungracious, veracious, vexatious, vinaceous, vitaceous, vivacious, volacious, voracious

4 syllables:
acanaceous, acanthaceous, acinaceous, alliaceous, alsinaceous, alutaceous, amentaceous, ampullaceous, amylaceous, anonaceous, arboraceous, arenaceous, argillaceous, avenaceous, betulaceous, bombacaceous, brassicaceous, butyraceous, camphoraceous, capillaceous, carbonaceous, cichoraceous, cinchonaceous, cineraceous, columbaceous, conchylaceous, confervaceous, contumacious, corallaceous, coriaceous, corollaceous, crassulaceous, cycadaceous, cylindraceous, cyperaceous, dematiaceous, dipsacaceous, disputatious, efficacious, ericaceous, erinaceous, farinaceous, ferulaceous, foliaceous, fringillaceous, frumentaceous, furfuraceous, gallinaceous, gentianaceous, graminaceous, hederaceous, iridaceous, juglandaceous, lamiaceous, liliaceous, litigatious, lomentaceous, magnoliaceous, marmoraceous, meliaceous, membranaceous, mimosaceous, miniaceous, nymphaeaceous, ochraceous, oleaceous, oleraceous, olivaceous, onagraceous, orchidaceous, ostentatious, paleaceous, pandanaceous, papyraceous, pectinaceous, perspicacious, pervicacious, piperaceous, pistillaceous, plumulaceous, porphyraceous, priapatius, primulaceous, proteaceous, proteinaceous, pulveraceous, pyritaceous, ramentaceous, resinaceous, rubiaceous, salicaceous, sanguinaceous, santalaceous, sapindaceous, saponaceous, sapotaceous, sarmentaceous, scolopaceous, scoriaceous, sepidaceous, solanaceous, solenaceous, stercoraceous, stipulaceous, strobilaceous, styracaceous, subcrustaceous, subglumaceous, tiliaceous, trepidatious, turbinaceous, unveracious, urticaceous, verbenaceous, violaceous, xyridaceous

5 syllables:
agaricaceous, amarantaceous, amaranthaceous, amygdalaceous, apiaceous, apocynaceous, araliaceous, arundinaceous, asclepiadaceous, atramentaceous, aurantiaceous, balsaminaceous, berberidaceous, bignoniaceous, boraginaceous, bromeliaceous, campanulaceous, capparidaceous, cepaceous, conchyliaceous, convolvulaceous, cucurbitaceous, diatomaceous, equisetaceous, geraniaceous, inefficacious, lobeliaceous, loganiaceous, malpighiaceous, marasritaceous, margaritaceous, menispermaceous, molendinaceous, nucamentaceous, nucumentaceous, nyctaginaceous, orobanchaceous, oxalidaceous, papaveraceous, pergamentaceous, pilosebaceous, plantaginaceous, plumbaginaceous, polygalaceous, polygonaceous, portulacaceous, ranunculaceous, saxifragaceous, simaroubaceous, sterculiaceous, supracretaceous, unostentatious, zingiberaceous, zygophyllaceous

6 syllables:
amaryllidaceous, anacardiaceous, caprifoliaceous, caryophyllaceous, chenopodiaceous, euphorbiaceous, extrafoliaceous, hamamelidaceous, hydrocarbonaceous, interfoliaceous, intrafoliaceous, lycopodiaceous, ovate-cylindraceous, papilionaceous, polemoniaceous, scrophulariaceous, suprafoliaceous, valerianaceous

7 syllables:
argillo-areenaceous, ovato-cylindraceous

8 syllables:
calcareo-argillaceous

2 syllables:
basis, davis, aphis, dreyfus, dreyfuss, stasis

3 syllables:
cash basis

4 syllables:
epistasis, hypostasis, rhadamnathus

5 syllables:
accrual basis, bilharziasis, atelectasis

6 syllables:
bacteriostasis, arteriectasis

7 syllables:
on a regular basis

8 syllables:
on an irregular basis

9 syllables:
on an individual basis