Sat Word language is an important part and component of the system, we might know just the words, but they may not have knowledge of the subject language.
Word is an important part of language study exams. And creating components of the language system But we may not know the words, but may not know the language.
Word is an important part of language education. And build the components of the system language. But people may know the vocabulary but might have no knowledge about language.