How many onomatopoeic words are there?

Answer 1

3-letter words

aim, ain, ait, ama, ami, amp, ana, ane, ani, ant, ape, apt, ate, eat, eon, eta, imp, ion, mae, man, map, mat, men, met, moa, mon, moo, mop, mot, nae, nam, nap, net, nim, nip, nit, nom, noo, not, oat, one, oot, ope, opt, pam, pan, pat, pea, pen, pet, pia, pie, pin, pit, poi, pot, tae, tam, tan, tao, tap, tea, ten, tie, tin, tip, toe, tom, ton, too, top

4-letter words

aeon, amen, amia, amie, amin, anoa, anta, ante, anti, atap, atma, atom, atop, emit, etna, into, iota, item, main, mana, mane, mano, mate, mean, meat, meno, meta, mien, mina, mine, mint, mite, moan, moat, mono, moon, moot, mope, mote, name, naoi, nape, neap, neat, nema, nipa, noma, nome, nope, nota, note, omen, omit, onto, open, pain, pane, pant, pate, pean, peat, pein, pent, peon, pian, pima, pina, pine, pint, pion, pita, poem, poet, pome, pone, poon, tain, tame, tamp, tapa, tape, team, temp, tepa, time, tine, toea, tome, tone, toom, toon, tope, topi

5-letter words

amain, ament, amine, amino, amnia, anima, anime, antae, apian, apnea, atman, atone, entia, inapt, inept, mania, manta, matin, meant, menta, minae, monie, monte, netop, nomoi, oaten, opine, paean, paeon, paint, panto, paten, patin, patio, piano, pieta, pinot, pinta, pinto, piton, point, tempi, tempo, tenia, tinea, toman, topoi

6-letter words

anemia, anomie, anopia, apnoea, etamin, impone, inmate, manito, motion, omenta, opiate, optima, optime, option, pantie, patina, patine, pinata, pineta, pitman, pitmen, pointe, potion, potman, potmen, taenia, taipan, tamein, tampan, tampon, teopan

7-letter words

amentia, amniote, amotion, animate, animato, emotion, ipomoea, maintop, metopon, patinae, pimento, ptomain, tampion, timpana, timpano, tompion

8-letter words

ptomaine

12-letter words

onomatopoeia

Answer 2

I don't know how many but here's some:

splash

crash

bang

boom

pop

crack

smack

pow

twang

smash

ping

baa

moo

screech