Annexing rhymes with:
flexing, perplexing, vexing, affixing, boxing, coaxing, faxing, fixing, flexing, indexing, intermixing, mixing, outfoxing, perplexing, relaxing, taxing, vexing, waxing, xeroxing
Annexing sounds like:
ahmanson's, ahmansons, amassing, amazing, amazon's, amazonians, amazons, amgen's, amusing, anagnos, anguishing, announcing, ansang