Urchin rhymes with:
abstention, appalachian, bastion, christian, cichon, circumvention, combustion, congestion, contravention, cretchen, digestion, duchon, eachan, exhaustion, fanchon, faustian, fortune, gretchen, inattention, indigestion, ingestion, intention, intervention, ketchen, kitchen, luncheon, mcchristian, mccutchan, mccutchen, mccutcheon, mceachin, mcmichen, michon, misfortune, mitchen, molchan, muenchen, neukirchen, nonintervention, patchen, pichon, ponchan, question, rochon, sachin, sebastian, strachan, suchan, suggestion, truchan, vachon
Urchin sounds like:
urgen, ursin, ursini, urson, uruguayan