Foursquare rhymes with:
square, square, almaguer, aware, beware, forswear, laware, microware, square, swear, unaware, ware, wear, wehr, werre, where
Foursquare sounds like:
faragher, farquar, farquhar, ferger, fiercer, foraker, forcier, forger, forgery, forker, forquer, forswear, frager, fraiser, fraizer, fraker, fraser, frasher, frashier, frasier, frasure, frazer, frazier, freezer, fresher, freshour, fricker, frucher, furiouser