Expanse rhymes with:
advance, alamance, anse, askance, chance, crance, dance, duran's, enhance, finance, france, glance, hance, lafrance, lance, mance, mccance, nance, perchance, pomerance, pomeranz, prance, rance, refinance, romance, schanz, schranz, stance, trance, underfinance, vance
Expanse sounds like:
equibank, equipping, escaping, espinosa, espinoza, espionage, expanses, expense, expenses, expunge