the diference between youth and young

In terms of nature,youth is a n. but young both can be both uesed as n. and adj.
Speaking from the meaning of a word, yaung for the term and youth can exchange.
从词性上来说，youth是名词，而young既可以作名词，也可以作形容词。
从词意上来说，yaung作名词时可以和youth互换。

Youth is a noun while young usually used as an adjective. Youth center on the period that someone is young or the young generation, and when young used as a noun, it means a young person.