Here's what rhymes with costarius.
various carious hilarious vicarious precarious gregarious nefarious Words that almost rhyme with costarius
wistarias chariots variance covariance penniless pettiness hairiness scariness tetchiness peppiness readiness variants abstemious censorious deadliness sketchiness headiness stealthiness legginess dressiness peskiness invariance compendious healthiness ordinariness cerements literariness sexiness twentieths lengthiness recreants trendiness smelliness wealthiness invariants comeliness necessitous homeliness provenience temporariness arbitrariness unhealthiness