lifestyle vs life style

lifestyle and life style both are nouns.

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

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

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

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

lifestyle (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