How many letters does the top answer for “the act of caressing with the lips (or an instance thereof)” have?

The most common answer is buss (4 letters).

Crossword clue: the act of caressing with the lips (or an instance thereof)

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

buss 4 letters wn-def

the act of caressing with the lips (or an instance thereof)

kiss 4 letters wn-def

touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, e

osculation 10 letters wn-def

the act of caressing with the lips (or an instance thereof)