Has-beens rhymes with:
might-have-beens, askin's, buckskins, crooklyn's, hutchins, joycelyn's, junkins, kingpins, medecins, might-have-beens, mullins, pigskins, puffins, redskins, redskins', solwin's, unitrin's
Has-beens sounds like:
hispanic, hispanics, hoogovens, housekeeping, hughbanks