HSK 7-9
成年
chéngnián副
to grow to adulthood; fully grown; adult; the whole year
这只小鸟已经成年。
Zhè zhǐ xiǎo niǎo yǐ jīng chéng nián.
This bird has already reached adulthood.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.