How many letters does the top answer for “director of rushmore” have?

The most common answer is anderson (8 letters).

Crossword clue: director of rushmore

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

anderson 8 letters wd-fact-v3

United States physicist who discovered antimatter in the form of an antielectron that is called the positron (1905-1991)

director of 9-1-1 50% similar → bassett

director of 90210 50% similar → grimes

director of her 50% similar → phoenix

director of q13415681 50% similar → hamill

director of q20856802 50% similar → gosling

director of q23685878 50% similar → levi

director of q60102 50% similar → adlon, shalhoub

director of q79784 50% similar → cox