girlfriend

nouns

any female friend
"Mary and her girlfriend organized the party"
girlfriend
is a type of (narrower)
a person you know well and regard with affection and trust
"he was my best friend at the university"
friend
is a type of (narrower)
an adult female person (as opposed to a man)
"the woman kept house while the man hunted"
adult female, woman
a girl or young woman with whom a man is romantically involved
"his girlfriend kicked him out"
girl, girlfriend, lady friend