Friend - n. 1) a person whom one knows well and is fond of, 2) an ally, supporter, or sympathizer.
Acquaintance - n. 1) Knowledge got from personal experience, 2) a person whom one knows slightly.
Pal - n. 1) A close friend.
Buddy - n. 1) a comrade; pal.
Comrade - n. 1) a friend; close companion, 2) an associate.