Proponent rhymes with:
opponent, component, opponent, component, conant, opponent, abstinent, complainant, complainant's, component, conant, consonant, contaminant, continent, covenant, determinant, dissonant, dominant, eminent, exponent, fagnant, hinnant, immanent, imminent, impertinent, incontinent, indignant, lieutenant, magnant, malignant, midcontinent, opponent, pennant, permanent, predominant, preeminent, pregnant, prominent, recombinant, remnant, repugnant, resonant, ruminant, semipermanent, stagnant, subcontinent, suprenant, surprenant, tenant, tennant, tennent, tousignant, whisenant, whisnant, whisonant, winant
Proponent sounds like:
perfumed, pierpoint, pierpont, pierrepont, prepayment, prevent, prevented, profanity, profound, propound, propounded, provant