Ovoid rhymes with:
ackroyd, adenoid, alkaloid, amyloid, android, asteroid, aykroyd, boothroyd, celluloid, corticosteroid, hemorrhoid, holroyd, mongoloid, nedlloyd, oldroyd, paranoid, polaroid, rheumatoid, rhizoid, sinusoid, spheroid, unalloyed, vescinoid
Ovoid sounds like:
obadiah, obeid, obeyed, obit, obviate, obviated, offbeat, offutt, oft, opiate, opt, opted, opto, ovate, ovett, oviatt, oviedo, ovitt