Greenspan's rhymes with:
c-span's, lifespans, bedpans, c-span's, lifespans, afghanistan's, afghanistans, afghans, alcan's, bedpans, businessman's, c-span's, caftans, callahan's, caltrans, caravans, goodman's, intertrans, lifespans, lumberman's, meehans, pakistan's, rosecrans, rosenkrans, stockman's, tajikistan's, taliban's, talibans, tarzan's