lifesize vs life-sized

lifesize and life-sized both are adjectives.

Word	Noun	Adjective	Verb	Adverb
lifesize	No	Yes	No	No
life-sized	No	Yes	No	No

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

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

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