Sylvanus rhymes with:
cavaness, ravinus, baroness, cabaniss, cavaness, debonis, diaphanous, genuineness, gurganus, marchioness, ravinus, simonis
Sylvanus sounds like:
scalping, shelving, slapping, slavens, slavinski, sleepiness, sleeping, slip-ons, slipping, slivinski, sloping, sloppiness, slovenes, solvency, solving, sullivan's, sullivans