Rather's rhymes with:
cather's, cathers, flathers, gathers, lathers, mathers, slathers, smathers, another's, bathers, bellwethers, birdfeather's, birdfeathers, bothers, brother's, brothers, brothers', carithers, carothers, carrithers, carrothers, carruthers, caruthers, cather's, cathers, crothers, dithers, druthers, father's, fathers, feathers, flathers, forefathers, furthers, gathers, get-togethers, gethers, godfather's, godfathers, godmothers, grandfather's, grandfathers, grandmother's, grandmothers, heather's, heathers, lathers, leathers, mathers, mother's, mothers, nethers, other's, others, others', slathers, smathers, smethers, smithers, smothers, southers, strothers, struthers, suthers, tethers, togethers, weather's, weathers, withers, zithers
Rather's sounds like:
radars, radiators, raider's, raiders, raiders', raters, reader's, readers, readers', reauthorize, redress, reeders, reiders, reiders', retiree's, retirees, retirees', retires, retrace, reuter's, reuters, reuters', reuters's, rhetoric, ridder's, rider's, riders, rieders, rieders', rioters, ritter's, roadwork, roderica, roderick, roderick's, rodrick, rodrigeuz, rodrigo, rodrigue, rodrigues, rodriguez, rodriguez's, rodriques, rodriquez, rooters, rothrock, rotors, rotruck, routers, ruder's, ryder's