Notion rhymes with:
bocian, commotion, demotion, devotion, emotion, hoeschen, kocian, laotian, locomotion, lotion, motion, ocean, potion, promotion
Notion sounds like:
nadein, nadine, nandaime, natan, nathan, nathania, nathene, nation, natuna, nayden, needham, neoteny, netan, netanyahu, newton, newtonian, newtown, newtowne, nineteen, nodine, nomination, noontime, notation, nothin, nothin', nowotny, nutone, nydam