Decorum rhymes with:
corum, aurum, borum, corum, forum, gorham, gorum, oram, orum, quiram, quorum, santorum, shoreham, sorum, yoram
Decorum sounds like:
dacron, decrane, degarmo, deguerin, dekroon, dezarn, dezern, diagram, dickerman, digeronimo, disarm, discern, disharmony, disharoon, ducharme