stria vs stretch mark

stria and stretch mark both are nouns.

Word	Noun	Adjective	Verb	Adverb
stria	Yes	No	No	No
stretch mark	Yes	No	No	No

As nouns, stretch mark is a hyponym of stria; that is, stretch mark is a word with a more specific, narrower meaning than stria:

stria: a stripe or stripes of contrasting color
stretch mark: a narrow band resulting from tension on the skin (as on abdominal skin after pregnancy)

Other hyponyms of stria include collar.

stria (noun)	stretch mark (noun)
a stripe or stripes of contrasting color	a narrow band resulting from tension on the skin (as on abdominal skin after pregnancy)
any of a number of tiny parallel grooves such as: the scratches left by a glacier on rocks or the streaks or ridges in muscle tissue