Lexicology
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Lexicology is the general and objective study of words and their meanings.
In some ways, it is the lexical part of philology.
In other ways it is closely related to etymology, phraseology, and semantics.
Lexicography can be said to be the applied part of lexicology, as it studies the use of words.
'Lexicography' is also and is often used to refer to the compilation of a lexicon. Note that lexicographer is a comparatively specific word, referring to someone who writes dictionaries.