grown vs full-grown

grown and full-grown both are adjectives.

Word	Noun	Adjective	Verb	Adverb
grown	No	Yes	No	No
full-grown	No	Yes	No	No

As adjectives, grown and full-grown are synonyms defined as:

Other synonyms of grown include adult, big, fully grown, grownup.

grown (adjective)	full-grown (adjective)
(of animals) fully developed	(of animals) fully developed