brownstone vs row house

brownstone and row house both are nouns.

Word	Noun	Adjective	Verb	Adverb
brownstone	Yes	No	No	No
row house	Yes	No	No	No

As nouns, row house is a hypernym of brownstone; that is, row house is a word with a broader meaning than brownstone:

brownstone: a row house built of brownstone; reddish brown in color
row house: a house that is one of a row of identical houses situated side by side and sharing common walls

Other hypernyms of brownstone include town house.

brownstone (noun)	row house (noun)
a row house built of brownstone; reddish brown in color	a house that is one of a row of identical houses situated side by side and sharing common walls
a reddish brown sandstone; used in buildings