Faxing rhymes with:
relaxing, taxing, waxing, affixing, annexing, boxing, coaxing, fixing, flexing, indexing, intermixing, mixing, outfoxing, perplexing, relaxing, taxing, vexing, waxing, xeroxing
Faxing sounds like:
facing, facings, faking, fasching, fashion's, fashioning, fashions, fausnaugh, feagans, feagins, feigning, figgins, fijians, fishing, fisons, fixing, fixings, focusing, fosamax, fosnaugh, foxman's, fucking, fujisankei, fukunaga, fusing, fussing