辭典學
Lexicology \Lex`i*col"o*gy\ (-j[y^]), n. [Gr. lexiko`n lexicon + -logy: cf. F. lexicologie.] The science of the derivation and signification of words; that branch of learning which treats of the signification and application of words.
lexicology n : the branch of linguistics that studies the lexical component of language