Each one word - contains its meaning and implications. Some call another cat or a dog and other people another call another person . Personally, for me , a friend - a person who can tell you a secret , to share happy or sad news. Friend, the one who always support , will assist you and will not leave in the lurch . These are friends. Also, the other can have a good rest on the rink or in the cinema , disco , and so on . But I want to say that in our time very few real friends . So , choose one carefully .