1) Linguistics 2) Study of word meanings 1) Onomastic 2) Onomastics 
Lexicology is the part of linguistics which studies words. This may include their nature and function as symbols their meaning, the relationship of their meaning to epistemology in general, and the rules of their composition from smaller elements (morphemes such as the English -ed marker for past or un- for negation; and phonemes as basic sound un...
study of words and their meanings
• (n.) The science of the derivation and signification of words; that branch of learning which treats of the signification and application of words.
Lex`i·col'o·gy (-jȳ) noun [ Greek 
[n] - the branch of linguistics that studies the lexical component of language
lexicology, lexicological 1. The branch of linguistics dealing with the use and meanings of words and the relationships between items of vocabulary. 2. The study of the meanings and origins of words.
noun the branch of linguistics that studies the lexical component of language
the branch of linguistics that studies the lexical component of language