Words That Rhyme With "Roominess" :

3 syllables:

commonness, homeyness, laminous, luminous, numinous, ominous

4 syllables:

abdominous, acuminous, albuminose, albuminous, aluminous, bituminous, leguminous, putaminous, trigeminus, voluminous

5 syllables:

diplostemonous, isostemonous