life style vs modus vivendi

life style and modus vivendi both are nouns.

Word	Noun	Adjective	Verb	Adverb
life style	Yes	No	No	No
modus vivendi	Yes	No	No	No

As nouns, life style and modus vivendi are synonyms defined as:

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

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

life style (noun)	modus vivendi (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
	a temporary accommodation of a disagreement between parties pending a permanent settlement