Synonyms for Heighten:

n.

run, engulf, grip, color, sweep over, pulse, surge, come over. redouble, aggravate. heighten (noun)
intensify, rise, deepen, compound.
increase (noun)
strengthen, redouble.

v.

change (verb)
sharpen, rise.
elevate (verb)
rise, hoist, upraise, lift, erect, rear, levitate, exalt, uplift.
heighten (verb)
loft.
increase (verb)
augment, lengthen, multiply, accrue, elevate, fatten, advance, extend, enlarge, widen, burgeon, amplify, broaden, reinforce, expand, increment, inflate, maximize, upgrade, raise, add, boost, grow.
intensify (verb)
lift, elevate, augment, deepen, enlarge, underline, boost, intensify, stress, accentuate, exalt, raise, magnify, sharpen, exaggerate, strengthen, increase, emphasize, amplify, extend, escalate.

Other synonyms:

sweep over. engulf, aggravate, redouble. come over. surge, pulse. color. run. expand
expand.
intensify
redouble.
lift up
elevate.

Usage examples for heighten

  1. This now shall be so far from being an ease unto them, that it shall most wonderfully aggravate or heighten their torment, as I said before. – The Works of John Bunyan Volume 3 by John Bunyan
  2. The moonlight seemed to heighten the effect of it. – The Chouans by Honore de Balzac