Crowther's rhymes with:
crowthers, crowthers, crowthers, arthur's, arthurs, author's, authors, authors', coauthors, crowthers, ethers, fathers', mothers', panther's, panthers, panthers', walthers
Crowther's sounds like:
carithers, carothers, carrithers, carrothers, carruthers, carter's, carters, caruthers, charter's, charterhouse, charters, chartres, chartreuse, corridors, courter's, courtiers, craters, creators, creatures, creditors, creditors', critters, crothers, crowthers, curator's, curators, czartoryski