Synonyms for Heighten (same or very similar meaning)
WordNet sense 1 (become more extreme):
riseWordNet sense 2 (make (one's senses) more acute):
sharpenWordNet sense 3 (increase):
enhance, raiseWordNet sense 4 (make more intense, stronger, or more marked):
compound, deepen, intensify, compoundFrom the ODE community, based on WordNetadd/edit