way of life vs Sunna

way of life and Sunna both are nouns.

Word	Noun	Adjective	Verb	Adverb
way of life	Yes	No	No	No
Sunna	Yes	No	No	No

As nouns, Sunna is a hyponym of way of life; that is, Sunna is a word with a more specific, narrower meaning than way of life:

way of life: a course of conduct
Sunna: (Islam) the way of life prescribed as normative for Muslims on the basis of the teachings and practices of Muhammad and interpretations of the Koran

Other hyponyms of way of life include ambages, primrose path, straight and narrow, strait and narrow, hadith, Sunnah, warpath.

way of life (noun)	Sunna (noun)
a course of conduct	(Islam) the way of life prescribed as normative for Muslims on the basis of the teachings and practices of Muhammad and interpretations of the Koran