It is the study of the sounds of speech.
It involves practicing producing sounds, and figuring out which sound you heard.
It makes use of the phonetics in order to see how sounds or signs are arranged in a system for each language.
It is the study of how phrases, clauses and sentences are constructed and combined in particular languages.
Grammar
It is the study of meaning between words and phrases.
It is the study of how languages have changed over time.
It is the study of society and language and the correlation that exists between them.
It looks at how individual words are formed from morphemes.
It interacts with phonology and syntax.
It looks at bigger chunks of language, texts, conversations, stories, speeches, etc
It studies how speakers of a language use the language to communicate.
It looks at the relationship between speaker and listener.
It's the human system of sounds used to communicate meanings and feelings.