All and any one are synonyms for each. Neither is the opposite of each. We have given below a collection of synonyms for "each".
Each person has the right to have a different opinion on things, or each one's own opinion. Everyone has their own likes and dislikes. We are not all the same. For example, every fruit on the table was delicious. They have known each other since they were in primary school. Each of them sings a song.