How many letters does the top answer for “the act of changing one thing or position for another” have?

The most common answer is switching (9 letters).

Crossword clue: the act of changing one thing or position for another

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

switching 9 letters wn-def

the act of changing one thing or position for another

the act of adding one thing to another 57% similar → addition

the act of contacting one thing with another 57% similar → hitting, striking

the act of putting one thing into another 57% similar → insertion, intromission