Here's what rhymes with celk.
elk lc whelk yarmelke Words that almost rhyme with celk
sec shek ec ek haec heck check neck deck desk wreck cheque tech msec nec peck spec speck beck dec rec fleck lech trek exec hatcheck burlesque recheck bedeck kopeck grotesque arabesque statuesque spellcheck discotheque bottleneck turtleneck quarterdeck