life-style vs life style

life-style and life style both are nouns.

Word	Noun	Adjective	Verb	Adverb
life-style	Yes	No	No	No
life style	Yes	No	No	No

As nouns, life-style and life style are synonyms defined as:

life-style and life style: a manner of living that reflects the person's values and attitudes

Other synonyms of life-style include lifestyle, modus vivendi.

life-style (noun)	life style (noun)
a manner of living that reflects the person's values and attitudes	a manner of living that reflects the person's values and attitudes