Gaffe rhymes with:
gaf, gaff, assaf, behalf, braff, calf, carafe, chaff, fraph, gaf, gaff, giraffe, graf, graff, graph, haff, half, laff, laugh, naff, paff, pfaff, raf, raff, scaff, schaff, shaff, sielaff, skaff, staff, staph, taff, taffe, unitaf, yaffe
Gaffe sounds like:
gab, gaba, gabay, gabby, gabe, gabie, gaby, gaf, gaff, gaffey, gap, gape, gapp, gappa, gasify, gasp, gaspe, gaub, gave, gebbia, gebbie, gebo, geib, geoff, geva, giacobbe, giap, gib, gibb, gibby, gibe, gibeau, giff, giffy, gipe, gipp, giuseppe, give, giveaway, gob, gobi, gobie, gobioff, goff, goof, goofy, goop, goosby, gopi, gossip, gossipy, gouvea, gouveia, gov, gove, govea, guava, guba, guff, guffaw, guffey, guffy, guppy, gyp