Blacker rhymes with:
lacher, lacquer, slacker, acker, aker, akre, attacker, backer, bakker, bracher, bracker, cracker, hacker, lacher, lacquer, macher, makar, packer, racker, sacher, schacher, slacker, stacker, tacker, thacher, thacker, thakkar, tracker, vanacker, wacker, whacker, zacher
Blacker sounds like:
balaguer, balcer, balcor, balser, balsiger, balzer, belcher, beleaguer, belger, bellcore, belser, belzer, bilger, blackshear, blacksher, blackshire, blaiser, blaker, blaser, blasier, blauser, blazer, blazier, bleacher, bleaker, blecher, blecker, bleecker, bleeker, bleicher, bleser, blocher, blocker, blosser, bolger, bolker, bolliger, bolser, bulgaria, bulger, bulkier