Britannica rhymes with:
danica, finmeccanica, biotechnica, bjelasnica, bonica, danica, dominica, donica, finmeccanica, harmonica, konica, microelettronica, monica, telefonica, tunica, veronica, zenica
Britannica 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, britains, britons, britons', broadening, broadens, broadnax, brodnax, brooding, bruting, burdening, burdens, burdine's, burdines, burtness, burton's