lexical semantics vs semantics

lexical semantics and semantics both are nouns.

Word	Noun	Adjective	Verb	Adverb
lexical semantics	Yes	No	No	No
semantics	Yes	No	No	No

As nouns, semantics is a hypernym of lexical semantics; that is, semantics is a word with a broader meaning than lexical semantics:

lexical semantics: the branch of semantics that studies the meanings and relations of words
semantics: the study of language meaning

lexical semantics (noun)	semantics (noun)
the branch of semantics that studies the meanings and relations of words	the study of language meaning
	the meaning of a word, phrase, sentence, or text