男 + Noun
男 (nán) means "male" or "man" and is used as an attributive modifier before nouns to specify gender. It commonly appears in phrases like 男主角 (male lead), 男生 (male student), and 男朋友 (boyfriend).
这部电影的男主角是谁?
Zhè bù diànyǐng de nán zhǔjué shì shéi?
Who is the male lead in this movie?
我们班男生比女生多三个。
Wǒmen bān nánshēng bǐ nǚshēng duō sān ge.
There are three more boys than girls in our class.
她的男朋友在北京工作。
Tā de nán péngyǒu zài Běijīng gōngzuò.
Her boyfriend works in Beijing.