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From letters A, C, C, U, S, A, T, I, V, E  I made following words

10 letter words

accusative[17]

9 letter words

causative[14]

7 letter words

caveats[12], vacates[12], actives[12], saccate[11], ascetic[11], caustic[11], aviates[10]

6 letter words

cavies[11], vesica[11], caveat[11], vacate[11], atavic[11], active[11], civets[11], evicts[11], caseic[10], acetic[10], accuse[10], cactus[10], aviate[9], savate[9], casita[8], acuate[8], acutes[8], cuesta[8], cuties[8]

5 letter words

cavie[10], caves[10], vices[10], vatic[10], civet[10], evict[10], vacua[10], caeca[9], cacas[9], cacti[9], cusec[9], vitae[8], avast[8], stave[8], vesta[8], vista[8], suave[8], uveas[8], vatus[8], aecia[7], saice[7], aceta[7], caste[7], cates[7], cesta[7], taces[7], cesti[7], cites[7], cause[7], sauce[7], acute[7], cutie[7], scuta[7], cutes[7], scute[7], cutis[7], ictus[7], saute[5], etuis[5], suite[5]

4 letter words

cave[9], vice[9], vacs[9], caca[8], ceca[8], vasa[7], aves[7], save[7], vase[7], visa[7], vies[7], vise[7], vita[7], tavs[7], vast[7], vats[7], vest[7], vets[7], uvea[7], vaus[7], vatu[7], casa[6], aces[6], case[6], asci[6], ices[6], sice[6], acta[6], cate[6], tace[6], cite[6], etic[6], acts[6], cast[6], cats[6], scat[6], sect[6], cist[6], tics[6], cues[6], ecus[6], cute[6], cuts[6], scut[6], asea[4], ates[4], east[4], eats[4], etas[4], sate[4], seat[4], seta[4], teas[4], aits[4], sati[4], site[4], ties[4], etui[4], taus[4], utas[4], suet[4], utes[4], suit[4], tuis[4]

3 letter words

vac[8], ava[6], ave[6], via[6], vie[6], vas[6], vis[6], tav[6], vat[6], vet[6], vau[6], ace[5], ice[5], sac[5], sec[5], cis[5], sic[5], act[5], cat[5], tic[5], cue[5], ecu[5], cut[5], aas[3], sae[3], sea[3], ais[3], sei[3], ate[3], eat[3], eta[3], tae[3], tea[3], ait[3], tie[3], sat[3], tas[3], set[3], its[3], sit[3], tis[3], eau[3], sau[3], sue[3], use[3], tau[3], uta[3], ute[3], tui[3], uts[3]

2 letter words

aa[2], ae[2], ai[2], as[2], es[2], is[2], si[2], at[2], ta[2], et[2], it[2], ti[2], us[2], ut[2]