Panthers' rhymes with:
panther's, panthers, panther's, panthers, panther's, panthers, arthur's, arthurs, author's, authors, authors', coauthors, crowther's, crowthers, ethers, fathers', mothers', panther's, panthers, walthers
Panthers' sounds like:
painter's, painters, pandora's, pantera's, panther's, panthers, penders, pepenadores, pindaric, pointers, ponderosa, ponderosa's, ponderous, ponders, pounders