Here's what rhymes with composicionis.
macaronis Words that almost rhyme with composicionis
gnomish wholeness nobis yogis phobics closeness osmosis aerobics heroics moroseness stoics prolix crochets biopics jocoseness raviolis folklorists narcosis bowsprits telephonists xylophonists osteoporosis alkalosis postscripts agoraphobics bobolinks saxophonists trombonists vibraphonists tuberculosis atherosclerosis endometriosis myxomatosis toxoplasmosis