友達だ。（ともだちだ。） [to-mo-da-chi-da]. "Is friend." "Is a friend" or "I am your friend" can be as simple as that. 仲間（なかま）[na-ka-ma] is used to describe one's inner-circle of friends and 仲がいい（なかがいい）[naka-ga-ii] is used to explain that your relationship with one particular person is very good in terms of general timbre and communication. 友人（ゆうじん）[yuu-jin] Almost sounds like "Eugene" and means "friend" or "close friend," example:　彼は友人だ。（かれはゆうじんだ。）[ka-re-wa yuu-jin da] "He is a (close) friend."