How many letters does the top answer for “history of science scientist” have?

The most common answer is keller (6 letters).

Crossword clue: history of science scientist

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

keller 6 letters wd-fact-v3

United States lecturer and writer who was blind and deaf from the age of 19 months; Anne Sullivan taught her to read and

oreskes 7 letters wd-fact-v3

science scientist 67% similar → bacon, comenius

ancient history scientist 50% similar → meyer, vidalnaquet

applied science scientist 50% similar → gerlach

archival science scientist 50% similar → ehrle

art history scientist 50% similar → dvorak, elder, gombrich

church history scientist 50% similar → caesarea

cognitive science scientist 50% similar → chomsky, hayek

conceptual history scientist 50% similar → koselleck