Here's what rhymes with happiness.
sappiness snappiness Words that almost rhyme with happiness
fattiness faddiness patchiness chattiness nattiness scratchiness shagginess canniness tackiness bagginess gaseous habeas malleolus nastiness scantiness bassinets valiance brassiness glassiness classiness cragginess ambience ambiance dalliance craftiness ghastliness palliates draftiness pancreas bathyscaphs transience pantheists retaliates transients instantaneous