Epistemology
The word "epistemology" is derived from the ancient Greek "epistēmē" meaning "knowledge" and the suffix "-logy", meaning "logical discourse" (derived from the Greek word "logos" meaning "discourse"). It is analogue to the German "Wissenschaftslehre" (literally, theory of science) which was introduced by philosophers Johann Fichte and Bernard Bolzano in the late 18th century. The word first appeared in English in 1847 as a translation of the German in New York's "Eclectic Magazine" review of a philosophical novel by German author Jean Paul:
Erudition
The word erudition came into Middle English from Latin. A scholar is erudite (Latin "eruditus") when instruction and reading followed by digestion and contemplation have effaced all rudeness ("e- (ex-) + rudis"), that is to say smoothed away all raw, untrained incivility. Common usage has blurred the distinction from "learned" but the two terms are quite different.