Britains rhymes with:
britain's, britons, britons', britain's, britons, britons', britain's, britons, britons', gittens, kittens, litton's, mittens
Britains sounds like:
baritones, bartmess, bartnick, bartnicki, bartnik, barton's, bartunek, berating, birthing, boarding, boardinghouse, boardinghouses, boardings, borden's, bortnick, brademas, braiding, breading, breathing, breeden's, breeding, britain's, britannica, britons, britons', broadening, broadens, broadnax, brodnax, brooding, bruting, burdening, burdens, burdine's, burdines, burtness, burton's