Heightened rhymes with:
brightened, enlightened, frightened, lightened, tightened, unenlightened, brightened, buttoned, cottoned, disheartened, enlightened, fattened, flattened, frightened, heartened, heistand, hestand, hiestand, lightened, montand, predestined, shortened, smartened, straightened, sweetened, threatened, tightened, unbuttoned, unenlightened
Heightened sounds like:
hastened, heistand, hesitant, hestand, hiestand