Mermaids rhymes with:
bridesmaid's, bridesmaids, bridesmaids', rubbermaid's, accolades, barricades, bridesmaid's, bridesmaids, bridesmaids', escapades, everglades, everglades', marinades, marmalades, motorcades, renegades, rollerblades, rubbermaid's, switchblades
Mermaids sounds like:
marantz, marinades, marinates, marmaduke, marmaduke's, marymount's, miramontes, miranda's, muramatsu