Nouns

(n)heat, heat energya form of energy that is transferred by a difference in temperature
(n)hotness, heat, high temperaturethe presence of heat
(n)heat, warmththe sensation caused by heat energy
(n)heat, warmth, passionthe trait of being intensely emotional
(n)estrus, oestrus, heat, rutapplies to nonhuman mammals: a state or period of heightened sexual arousal and activity
(n)heata preliminary race in which the winner advances to a more important race
(n)heating system, heating plant, heating, heatutility to warm a building“the heating system wasn't working”, “they have radiant heating”

Verbs

(v)heat, heat upmake hot or hotter“the sun heats the oceans”, “heat the water on the stove”
(v)heatprovide with heat“heat the house”
(v)inflame, stir up, wake, ignite, heat, fire uparouse or excite feelings and passions“The ostentatious way of living of the rich ignites the hatred of the poor”, “The refugees' fate stirred up compassion around the world”, “Wake old feelings of hatred”
(v)heat, hot up, heat upgain heat or get hot“The room heated up quickly”