Here's what rhymes with fourthbest.
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deft left theft bereft weft cleft refreshed enmeshed spent text debt belt bent checked dealt stepped bet jet tent pet decked dent pent spelt get next set went yet cent direct felt kept let met respect sent meant net threat reject rent slept stretched swept wet lent melt sect sweat dwelt knelt leaped repent scent sensed sketched vent wept wrecked adept dreamt fetched flexed leapt tempt vexed duet fenced fret necked smelt vet against effect subject extent percent attempt correct event expect perfect affect forget helped protect reflect select descent detect intent suspect architect assent cement elect erect offset upset alphabet ascent beset crept dissent inspect lament dispensed drenched ferment resent reset beget cadet inept inject orient pipette redirect shipwrecked unchecked wrenched except accept prevent president collect commenced indirect regret accent cigarette connect dialect condensed invent augment bayonet cassette clenched epithet outstretched parapet perplexed quenched deflect infect preset quartet silhouette represent consent contempt intellect neglect exempt incorrect entrenched recollect retrospect underwent intercept intersect circumspect disrespect transept discontent circumvent clarinet disconnect