Longest rhymes with:
strongest, nagengast, schrecengost, schreckengost, schrecongost, strongest, youngest, aug, august, auguste, biggest, nagengast, schrecengost, schreckengost, schrecongost, strongest, winningest, wolgast, youngest
Longest sounds like:
lamaist, lanai-city, lancet, lancit, lanctot, langguth, langseth, languid, languished, lanzet, launched, leanest, length, lengthy, leninist, linguist, linked, linquist, linscott, linseed, lionized, longed, longitude, longshot, longuet, longwood, lunched, lunged, lynched