Contrary to popular opinion, the word "purple" does have rhymes in the English language. In fact, there are two rhyming words, abet words that aren't used in today's vernacular.

Hirple is a British word, which means "to walk lamely or hobble".

Curple is a word out of Scotland, which refers to the hindquarters of a horse. The current Shorter OED lists 'curple' dating from 1591.

Perhaps "nurple" could also be said to rhyme with purple, but I can't find any indication that Nurple is a proper English word. However, there exists such a drink as a "Purple Nurple", and a web site, nurple.com, that uses 'nurple' as a tag word. When does a made-up word enter proper usage? Who draws that line?