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