How many letters does the top answer for “author of axial age” have?

The most common answer is jaspers (7 letters).

Crossword clue: author of axial age

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

jaspers 7 letters wd-fact-v3

German psychiatrist (1883-1969)

author of ice age 50% similar → romano

author of the age of reason 50% similar → paine

wrote axial age 50% similar → jaspers