Here's what rhymes with undeclare.
rare declare glare lair their there where care bear fair hair share chair pair prayer wear bare dare fare tear faire hare mare ware flare mer pear flair guerre mehr cher fere mair pare sehr thair blare aware square affair despair repair spare swear stare beware impair scare snare stair affaire bugbear curare repairer tinware coheir prepare compare unfair forbear underwear disrepair ensnare midair billionaire parterre dinnerware maidenhair beachwear backstair everywhere anywhere unaware millionaire thoroughfare doctrinaire debonair horsehair solitaire tableware forswear medicare chinaware outerwear overbear spyware eldercare ironware legionnaire millionnaire broodmare debonaire funfair camelhair setsquare earthenware silverware aftercare commissionaire foursquare kitchenware foreswear ovenware wirehair questionnaire concessionaire multimillionaire extraordinaire Words that almost rhyme with undeclare
yell well cell tell fell del sell bell hell shell gel tel dell delle excel nel belle celle quell weal bel knell nell quel sel telle jell smell dwell spell swell dispel expel repel befell cartel gaol gazelle impel lapel resell retell morel noel parallel hotel compel farewell foretell motel nouvelle propel unwell materiel pastel carousel bagatelle caravel undersell nacelle novelle carrousel outsell personnel citadel clientele infidel decibel organelle misspell nonparallel muscatel oversell tagliatelle mademoiselle fontanelle photocell commonweal antipersonnel zinfandel therefor