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"warmth" is also used as a crossword clue. If that's what you saw, the answer is often heat (4 letters).
Definitions
a quality proceeding from feelings of affection or love
Word origin
From Middle English warmth, warmeth, wermþe, from Old English *wiermþu (“warmth”), from Proto-West Germanic *warmiþu (“warmness; warmth”), corresponding to warm + -th (abstract nominal suffix). Cognate with Saterland Frisian Waarmte (“warmth”), West Frisian waarmte (“warmth”), Dutch warmte (“warmth”), German Low German Warmte, Warmt (“warmth”).
Used in a sentence
“"You don't know him—don't pronounce an opinion upon him," I said with warmth.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Gentle heat”6 letters
02“Heat or friendliness”6 letters
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