i Register
In some senses, friendgirl is marked as colloquial. Watch for register when choosing this word.
noun
A female friend, as opposed to a girlfriend or lover.
Newfoundlanders are contrary people who often speak or act back foremost, saying friendgirl, ashore for aboard, boy for man, gaffer for boy, and young fellow for any unmarried man under middle age.
A girlfriend, although of less intensity.