Gluttonous rhymes with:
chitinous, gelatinous, monotonous, mountainous, mutinous, tetanus, titinus, androgynous, asynchronous, bituminous, brazenness, chitinous, deaconess, exogenous, gelatinous, givenness, homogenous, indigenous, larcenous, luminous, membranous, monotonous, mountainous, mutinous, nitrogenous, nonpoisonous, oleaginous, ominous, outspokenness, patroness, poisonous, polygynous, ravenous, ruinous, tetanus, titinus, uranus, villainous, voluminous
Gluttonous sounds like:
gaulding, gelatinous, gilding, gjelten's, gladding, gliding, gloating, glutamic, gluttons, golden's, golding, goldman's, goldmans, goulding