Infests rhymes with:
fests, arrests, attests, bequests, best's, breasts, chests, crests, digests, divests, fests, guest's, guests, guests', invests, jests, midwest's, molests, natwest's, nests, northwest's, norwest's, pests, quests, reinvests, requests, rests, retests, southwest's, suggests, test's, tests, tests', vests, west's
Infests sounds like:
impacts, infectious, infects, invests