Douglass rhymes with:
douglas's, douglas's, douglas's, atlas's, dallas's, douglas's, nautilus's, necklaces, nicholas's, nicklaus's, surpluses, wireless's
Douglass sounds like:
decals, decelles, dechellis, degaulle's, diesels, digalakis, disclose, discloses, diskless, dislike, dislikes, doglike, douglas, douglas', douglas's, doxologies, doxology, duclos, dyslexia, dyslexic