noun
lexicology
Academic term for the study of dictionaries, their compilation, and their use.
辞書学は言語学の一分野です。
Lexicology is a branch of linguistics.
言語学 is the broader field of linguistics, of which lexicology is a sub-discipline.
Compound of 辞書 (dictionary) and 学 (study, -ology). The exact historical derivation is uncertain, but the term follows the common pattern for academic disciplines.