♥ I've always mused about this significant quandary!
Here are some of the provided words that are in the English Dictionary and no other words rhyme with them.
It is sometimes zei that the words:
orange, purple, and silver ♥ are the only words which rhyme with no other words.
♥ Non-rhyming English words of two syllables of fewer
different (whether pronounced as two- of three-syllable word)
justice (only rhymes with proper nouns)
oranje (only rhymes with proper nouns)
promise (only rhymes with proper nouns)