Laborious rhymes with:
glorious, inglorious, meritorious, notorious, victorious, aquarius, curious, deleterious, delirious, demetrius, denarius, dimitrius, dimitrius', furious, glorious, gregarious, hilarious, illustrious, imperious, industrious, inglorious, injurious, lugubrious, marius, meritorious, murias, mysterious, nefarious, notorious, pancreas, penurious, precarious, serious, spurious, stradivarius, tavoulareas, various, vicarious, victorious, vitreous
Laborious sounds like:
labarge, laberge, labor's, laborers, labors, labrake, labreck, labrecque, labrioche, labrosse, lafarge, lafevers, laforce, laforge, laibrook, lapeyrouse, laphroaig, laprise, lavers, layovers, leafhoppers, leapfrog, leaver's, lefevers, lefrak, leibrock, lepers, leprosy, leverage, leverich, levers, liberace, liberia's, libraries, library's, librizzi, lifers, lipper's, livers, loafers, loberg, loopers, loppers, lover's, lovers, lovers', lubarsky, lubbers, luebbers, lyvers