I have seven letters.
The first two stand for a boy.
The first three stand for a girl.
The first four stand for a brave boy.
But all my letters stand for a brave girl.
What word am I?
The anwser: he
her
hero
heroine
(brave = γενναίος-α-ο, stand for = αντιπροσωπεύω, συμβολίζω)