1, well has two parts of speech. When used as an adverb, modify the verb to mean "very good, very satisfied", for example, she dances very well. She dances very well. You did a good job. You did a good job.

When used as an adjective, it means "good health, good health", such as: I feel good today. I feel very good today.

Good is an adjective and modifies a noun. Of a person or thing having good characteristics or essence. Mike is a good student. Mike is a good student.

This is good news for her. This is good news for her.

Nice is an adjective with certain emotional color. Emphasize people's feelings, including "beauty", "wonder" and "delicious". It can also mean "being friendly and kind" to people. Sandwiches are delicious. This sandwich is delicious. You are really nice. You are really nice.