Onnanoko (女の子) means "girl." This word specifically refers to a female child. It's formed by combining "onna" (woman/female) and "ko" (child), indicating a young person of the female gender. Use it when speaking about young females. Example: かわいい女の子ですね。(Kawaii onna no ko desu ne.) = She's a cute girl, isn't she?

子供(こども)の女性(じょせい)を指(さ)す言葉(ことば)です。「女(おんな)」と「子(こ)」でできています。例(れい)：かわいい女の子(おんなのこ)ですね。