nomadism vs life-style

nomadism and life-style both are nouns.

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

As nouns, life-style is a hypernym of nomadism; that is, life-style is a word with a broader meaning than nomadism:

nomadism: The way of life of people who, having no fixed home, move around seasonally in search of food, water and grazing etc.
life-style: a manner of living that reflects the person's values and attitudes

Other hypernyms of nomadism include life style, lifestyle, modus vivendi.

nomadism (noun)	life-style (noun)
The way of life of people who, having no fixed home, move around seasonally in search of food, water and grazing etc.	a manner of living that reflects the person's values and attitudes