Here's what rhymes with knowsbest.
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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 sent meant net threat rent slept stretched swept wet lent melt sect sweat dwelt knelt leaped scent sensed sketched vent wept wrecked adept dreamt fetched flexed leapt tempt vexed duet fenced fret necked smelt vet against effect subject extent percent respect attempt correct event expect perfect affect forget helped select descent detect intent reject suspect assent cement elect erect offset upset ascent beset crept dissent inspect repent dispensed drenched ferment beget cadet inept inject orient pipette shipwrecked unchecked wrenched except accept prevent protect reflect collect commenced indirect neglect accent cigarette connect dialect alphabet condensed invent lament augment bayonet cassette clenched epithet outstretched perplexed quenched resent reset deflect infect preset redirect consent president contempt intellect regret architect exempt incorrect entrenched underwent intercept intersect parapet quartet silhouette transept represent discontent recollect retrospect circumspect circumvent disconnect disrespect clarinet