full-size vs life-sized

full-size and life-sized both are adjectives.

Word	Noun	Adjective	Verb	Adverb
full-size	No	Yes	No	No
life-sized	No	Yes	No	No

As adjectives, full-size and life-sized are synonyms defined as:

Other synonyms of full-size include life-size, lifesize.

full-size (adjective)	life-sized (adjective)
being of the same size as an original	being of the same size as an original