1Semantics ... is the study of meaning. It focuses on the relation between signifies, such as words, phrases, signs and symbols, and what they stand for, their denotative
Semantics is the study of meaning in language. It can be applied to entire texts or to single words. For example, "destination" and "last stop" technically mean the same thing, but students of semantics analyze their subtle shades of meaning.
2.syntax ... is the study of the principles and rules for constructing sentences in natural languages.