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
Afraid is a synonym for scared. It begins with the letter a.
Learning
Satanic
Particle
agenda
Finish is another word for completion starting with the letter F.
Liberalness is another word for generosity starting with the letter L.
recover
another archive
used
The word can be: Trailer or trolley.
unclean :)
textile
littlest
domicile
mystified
throat