Each is a pronoun that means every one of two or more people or things, considered individually. It is used to refer to each person or thing separately. For example:

• Each student must hand in their homework.
• They each received a medal for their efforts.

Very is an adverb that means to a high degree or to a great extent. It is used to emphasize something or to indicate that something is true to a great degree. For example:

• She is very tired.
• He is very busy.

In summary, each is a pronoun that means every one of two or more people or things, considered individually, while very is an adverb that means to a high degree or to a great extent.