Celtics' rhymes with:
broomsticks, candlesticks, chopsticks, lipsticks, lunatics, nightsticks, politics, politics', upticks, yardsticks
Celtics' sounds like:
caltex, calutzi, caseloads, casualties, causalities, celtic, celtics, celts, chalets, child's, childhoods, childish, childs, chocolates, ciliates, claddagh, claudius, cleats, clites, clothes, cloths, clots, clouds, clowdus, clutch, clutches, clutts, colds, colledge, collides, colt's, coltec, colts, coolidge, coolidge's, coultas, cult's, cultic, cults, cul_de_sac, cyclades