Astonish rhymes with:
admonish, kronish, admonish, banish, barnish, benish, brownish, burnish, clannish, corniche, cornish, danish, diminish, finish, finnish, furnish, garnish, greenish, hanisch, hanish, harnisch, harnish, heinisch, janisch, janish, kronish, kunesh, manish, minish, ornish, pollyannish, punish, refinish, replenish, rheinisch, semifinish, spanish, stanish, tarnish, vanish, varnish, yanish
Astonish sounds like:
academic, academics, academies, academy's, acceding, accosting, accusations, acquisition's, acquisitions, acquitting, acting, actinomycosis, action's, actions, acuteness, agitating, ashton's, assistance, assisting, associating, association's, associations, astuteness, auction's, auctioning, auctions, augustinians, augustyniak, austen's, austin's