Which word refers to aspects related to language and sentence structure?

The term that encompasses aspects related to language and sentence structure is "linguistic." Linguistics is the scientific study of language, which includes the structure (grammar), meaning (semantics), and sounds (phonetics) of language.

While "grammatically" refers to the rules or principles governing the structure of sentences in a language, it is an adjective derived from the word "grammar" and therefore does not capture the broader scope of language study that "linguistic" does.

"Semantic" specifically relates to meaning and the interpretation of words and sentences, while "phonetic" pertains to sounds and their production in spoken language. Thus, while these words are relevant in the context of language, they do not specifically address the broader aspects of language and sentence structure as "linguistic" does.