Exxon's rhymes with:
nissan's, nissans, agans, ameron's, balfanz, chlorofluorocarbons, electrons, enron's, freons, futons, hermanns, icahn's, interferons, invitron's, johanns, leon's, michcon's, milacron's, negatrons, neurons, nissan's, nissans, ormiston's, pobanz, python's, raytheon's, revlon's, tampons, textron's, zircons
Exxon's sounds like:
eakins, easing, easygoing, echinacea, echoing, economic, economico, economics, economies, economize, economizes, economos, economy's, egging, eggnog, eggnogs, egomaniac, eischens, eisenach, eking, ekins, equinox, escamez, eschewing, eskenazi, eskimos, essence, eugenia's, eugenic, eugenics, eugenio's, examines, examining, exams, exchange, exchange's, exchanges, exchanges', excusing, exhumes, exigencies, exigency, exim's, exogenous