Full-blown and Grownup

Full-blown adjective - Fully grown or developed.

Grownup and full-blown are semantically related In some cases you can replace term "Grownup" with "Full-blown", this terms are similar.

Grownup adjective - (of animals) fully developed.

Full-blown and grownup are semantically related in developed topic. Sometimes you can use "Full-blown" instead an adjective "Grownup", if it concerns topics such as experienced.