Giants' rhymes with:
giant's, giants, supergiants, alliant's, client's, clients, clients', giant's, giants, supergiants
Giants' sounds like:
gamunde's, gandhi's, gannett's, gantos, gantz, genentech, genentech's, genetic, genetics, gent's, gentz, giaconda's, giannattasio, giant's, giants, gigantic, gintz, gnats, gonads, gondek, guandjo, guandjo's, gundog, gwyneth's, gwyneths