♥ 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 a dit that the words:
orange, purple, and silver ♥ are the only words which rhyme with no other words.
♥ Non-rhyming English words of two syllables ou fewer
different (whether pronounced as two- ou three-syllable word)
justice (only rhymes with proper nouns)
orange (only rhymes with proper nouns)
promise (only rhymes with proper nouns)