Alkaloid rhymes with:
celluloid, mongoloid, nedlloyd, amyloid, celluloid, mongoloid, nedlloyd, unalloyed, ackroyd, adenoid, amyloid, android, asteroid, aykroyd, boothroyd, celluloid, corticosteroid, hemorrhoid, holroyd, mongoloid, nedlloyd, oldroyd, ovoid, paranoid, polaroid, rheumatoid, rhizoid, sinusoid, spheroid, unalloyed, vescinoid