日本語
tomodachi
friend
yuujin
ゆうじん
"-desu" and "-masu" are used in polite speech. When speaking with people inside one's group ("uchi no hito" such as family members or close friends) this form of speech is often not used.
あいて
a companion ; one's partner ; the other party
しりあい
acquaintance
かおみしり
someone you know to see
こいびと
sweetheart ; boyfriend ; girlfriend ; lover
てき
enemy