Mcniff rhymes with:
sniff, biff, clif, cliff, cliffe, dif, diff, giff, griff, hieroglyph, if, jif, kiff, liff, liffe, mcgriff, riff, riffe, schiff, shiff, skiff, sniff, stiff, tiff, whiff, ziff
Mcniff sounds like:
macnab, macomb, magnify, mccomb, mccombie, mcnab, mcnabb, mcneff, micanopy, moczygemba