Here's what rhymes with umbras.
cumbrous Words that almost rhyme with umbras
wondrous compass buttress numbness bulbous lameness pumice dumbness rumpus justice colourless duchess fulness fungus oneness roughness toughness baseness dullness dulness lustrous piteous rashness encumbrance luckless talus alumnus cutlass hummocks incumbrance loveless tapas unctuous bumptious couscous fungous magus pashas ruckus substance circumference buckets buttocks encompass muskets sumptuous trumpets bloodless cements couplets puppets stasis stomachs doublets justness nuggets incubus smugness buffets covets ductless abundance judgments judgements incumbents hundredths bluntness effulgence numinous pedants reluctance indulgence inductance neuritis repugnance robustness abruptness abutments wantonness druggists fistulous adjustments conductance remonstrance unrighteousness resultants consultants reasonableness readjustments superabundance unreasonableness