What is another word for knowledge starting with the letter A?
Acumen, maybe? Acumen is more a description of natural ability,
though, rather than a synonym for erudition (which is the
accumulation of knowledge chiefly from books).
Acumen is synonymous with discernment, according to
Merriam-Webster's online dictionary: "a power to see what is not
evident to the average mind"
acquaintance
apprehension
acroama
awareness
apperception
assimilation
appreciation