2 letters:
ie, ro

3 letters:
ape, cue, key, neo, not, pun, put, say, wpm

4 letters:
aper, boom, bull, case, coin, crap, echo, emit, hale, head, kind, last, line, lost, mark, mime, mute, quad, roar, root, scat, shot, song, stab, stem, tell, text, tone, word

5 letters:
alter, blank, dirty, ditty, dunce, gloss, harsh, idiom, jaded, lexis, mouth, ology, point, rebus, shema, slang, space, state, tonal, tonic, utter, vouch, windy, wordy

6 letters:
alexia, answer, bitter, coiner, direct, echoic, ending, etymon, fusion, hummer, hyphen, id est, intend, ireful, jumble, latino, length, markup, masora, parrot, pencil, phrase, piracy, pirate, praise, prefix, prompt, purist, quaint, remind, render, report, resist, reword, rhythm, salute, smudgy, speech, sponge, string, suffix, syntax, urgent, verbal, wasted, zeugma

7 letters:
account, antonym, at ease, autocue, boswell, briefly, comment, concise, concord, copycat, cursive, defined, diction, dissent, elision, falsify, get out, homonym, hurtful, justify, let out, lexical, lexicon, mimesis, misused, portray, profane, protest, punning, rhyming, set off, shortly, shouted, similar, slander, slurred, smeared, smudged, speller, sputter, strange, swallow, synonym, tedious, telling, that is, thunder, tushery, uttered, verbose, wording, writing, yiddish

8 letters:
abstract, acrostic, adoption, anagrams, analysis, analytic, annotate, antonymy, apprisal, approval, assonant, backward, bonehead, citation, come out, contrary, converse, deletion, describe, dyslexic, eclipsis, ellipsis, emulator, geminate, horrible, imitator, in brief, in short, language, libretto, logomach, longhand, lunkhead, lyricist, monosemy, monotone, numerate, numskull, obsolete, omission, opposite, orthoepy, phrasing, pleonasm, prompter, rephrase, reproach, scrabble, sentence, smirched, songster, spelling, splutter, surtitle, synonymy, syntagma, unspoken, verbatim, verbiage, wordbook, wordless, wordplay

9 letters:
accidence, adverbial, agnus dei, ambiguous, assonance, auricular, blockhead, borrowing, caressive, collocate, concisely, concision, crossword, described, dies irae, dumb show, dyslectic, echolalia, emphasize, esperanto, etymology, expressed, flashcard, formulate, heteronym, homograph, homophone, homophony, hypallage, hyphenate, imitative, inflected, interpret, inversion, justified, lettering, let loose, macaronic, neologist, nonverbal, pantomime, pithiness, pronounce, proximate, redundant, reflexion, sardinian, speakable, subtilize, syllabify, syllepsis, synthetic, throwaway, translate, utterable, verbosity, word game, word play

10 letters:
acceptance, accidental, acting out, anastrophe, antithesis, antonymous, articulate, associable, concluding, confusable, connective, consonance, derivation, dictionary, dunderhead, expression, figurative, flash card, form class, hammerhead, hyphenated, iatrogenic, irish bull, lead sheet, librettist, lip reader, loggerhead, metathesis, millennium, morphology, muttonhead, nominative, nonliteral, obnubilate, outpouring, paraphrase, paregmenon, parisology, pasigraphy, plagiarism, plagiarist, pleonastic, polysemous, quaintness, reflection, res gestae, set phrase, songwriter, spatchcock, spoonerism, supertitle, synonymity, synonymous, tautologic, tongueless, verbalized, verbolatry, vocabulary, word class, word order

11 letters:
anadiplosis, appellation, appellative, articulated, articulator, catachresis, collocation, conciseness, concordance, conjunction, conjunctive, conjuration, contraction, contrastive, coreference, de-escalate, description, designation, epanalepsis, etymologize, golden rule, homophonous, hyphenation, incantation, indefinable, inscription, interlingua, interpolate, knucklehead, lingeringly, logomachist, long-winded, morphologic, nathan hale, nonsensical, paronomasia, phraseology, punctuation, spin doctor, superfluous, sympathetic, telegraphic, terminology, undefinable, unfortunate, uninflected, verboseness, vowel rhyme, well-chosen, word square, word string

12 letters:
actor's line, all together, alphabetical, ballad maker, construction, denomination, good speller, heartrending, inarticulate, inauspicious, incompatible, incompletely, misconstrual, nomenclature, notification, onomatopoeia, onomatopoeic, periphrastic, polysyllabic, poor speller, rebelliously, redefinition, scat singing, succinctness, tautological, unarticulate, uncharitable, unconsidered, well-meaning, word-perfect, word-worship

13 letters:
agglutination, agglutinative, characterized, complementary, contradictory, gesticulating, grammatolatry, line of verse, manifestation, morphological, onomatopoetic, opposite word, oregon jargon, phrasal idiom, polysynthetic, reduplication, rhyming slang, speech rhythm, spell-checker, substitutable, syllabication, unarticulated, unmentionable, verbalization, word for word

14 letters:
case agreement, chinook jargon, combining form, fluent aphasia, infelicitously, internal rhyme, in other words, letter-perfect, line of poetry, mental lexicon, naturalization, onomatopoeical, part of speech, plagiarisation, plagiarization, sesquipedalian, sesquipedality, synonymousness, textual matter, visual aphasia, word blindness, word structure

15 letters:
choice of words, consonant rhyme, create verbally, equivalent word, literary pirate, misconstruction, morphologically, sensory aphasia, sound structure, string of words, syllabification

16 letters:
crossword puzzle, direct discourse, direct quotation, four-letter word, free association, gender agreement, grammatical case, lexical database, number agreement, phrase structure, punctuation mark, spelling checker, theater prompter, words per minute

17 letters:
hysteron proteron, linguistic string, receptive aphasia, whole-word method

18 letters:
impressive aphasia, sentence structure, syllable structure, syntactic category, verbal description, wernicke's aphasia

19 letters:
compound morphology

20 letters:
bilingual dictionary, grammatical category, idiomatic expression

23 letters:
derivational morphology, inflectional morphology

28 letters:
four-letter anglo-saxon word