Twentieth rhymes with:
thirtieth, thirtieth, ardath, barath, behemoth, bernath, bismuth, colbath, conrath, cravath, dartmouth, demuth, donath, elizabeth, fagoth, faircloth, falmouth, fellmeth, goliath, gopinath, griffith, gwyneth, harvath, heimsoth, judith, kamrath, keinath, kollath, konrath, kossuth, kroboth, kunath, mammoth, massoth, milbrath, monmouth, morath, niemuth, plymouth, porath, portsmouth, pursueth, sabbath, samoth, schneckloth, spieth, suddath, sudduth, taketh, thirtieth, trembath, unrath, vollrath, walrath, warmoth, weymouth, wilmoth, zenith
Twentieth sounds like:
taint, tainted, tamed, tandy, tanimoto, tanned, tant, taunt, taunted, teamed, teammate, tedmond, tedmund, tenant, tend, tended, tenement, tenet, tennant, tennent, tent, tenth, tenuta, tettamanti, themed, thinned, timed, timeout, timid, timidity, timothea, timothy, tint, tinted, tinto, titanate, tomato, tomatoe, tomita, tonawanda, tonda, toned, tonite, tonti, toutant, tummond, tunde, tuned, twenty, twined, tymnet