Submerge rhymes with:
emerge, merge, reemerge, berge, birge, burdge, converge, dirge, diverge, emerge, merge, purge, reemerge, scourge, serge, splurge, spurge, surge, urge, verge, virge
Submerge sounds like:
shipowners, sophomores, sophomoric, souvenirs, spinner's, spinners, submerse