Mcorp's rhymes with:
citicorp's, citicorps, citicorps', gencorp's, newscorp's, unicorp's, citicorp's, citicorps, citicorps', gencorp's, newscorp's, unicorp's
Mcorp's sounds like:
macrophage, macrophages, microbes, microfiche, microvax, microwaves, monocarpic, musgrave's