life-style vs nomadism

life-style and nomadism both are nouns.

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

As nouns, nomadism is a hyponym of life-style; that is, nomadism is a word with a more specific, narrower meaning than life-style:

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

Other hyponyms of life-style include fast lane, free living, vanity fair, settledness.

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