Full-grown and Grown-up

Full-grown adjective - (of animals) fully developed.

Grown-up is a synonym for full-grown in adult topic. In some cases you can use "Grown-up" instead the phrase "Full-grown" as an adjective or a noun, when it comes to topics like youth, animal, grown. popular alternative

Grown-up adjective - Relating to or typical of adults; displaying proper maturity.

Full-grown is a synonym for grown-up in adult topic. You can use "Full-grown" instead the phrase "Grown-up" as an adjective or a noun, if it concerns topics such as youth, animal, grown, fully grown. popular alternative