Gannett's rhymes with:
janet's, planet's, planets, baronets, benet's, bennett's, bluebonnets, cabinet's, cabinets, chestnuts, coordinates, electromagnets, hornet's, hornets, ignatz, janet's, laminates, magnet's, magnets, minute's, minutes, minutes', peanuts, planet's, planets, tenets, unfortunates, units
Gannett's sounds like:
gamunde's, gandhi's, gantos, gantz, genentech, genentech's, genetic, genetics, gent's, gentz, giaconda's, giannattasio, giant's, giants, giants', gigantic, gintz, gnats, gonads, gondek, guandjo, guandjo's, gundog, gwyneth's, gwyneths