Dictionary:

warmth

  (wôrmth)

1. The state, sensation, or quality of producing or having a moderate degree of heat: an agreeable warmth in the house.
2. 1. Friendliness, kindness, or affection: human warmth.
   2. Excitement or intensity, as of love or passion; ardor.
3. The glowing effect produced by using predominantly red or yellow hues.

[Middle English warmeth, from warm, warm. See warm.]

noun

1. The quality of being pleasant and friendly: affability, agreeability, agreeableness, amenity, amiability, amiableness, congeniality, congenialness, cordiality, cordialness, friendliness, geniality, genialness, pleasantness, sociability, sociableness. See attitude/good attitude/bad attitude/neutral attitude, good/bad.
2. Intensity of feeling or reaction: excitation, excitement, heat. See excite/bore/interest, feelings, hot/cold/lukewarm.

Definition: heat
Antonyms: chill, cold, cool

The noun has 5 meanings:

Meaning #1: the sensation caused by heat energy
  Synonym: heat

Meaning #2: a warmhearted feeling
  Synonym: warmheartedness

Meaning #3: the quality of having a moderate degree of heat
  Synonym: warmness

Meaning #4: intense passion or emotion
  Synonyms: heat, passion

Meaning #5: a quality proceeding from feelings of affection or love
  Synonyms: affectionateness, fondness, lovingness