death row vs death house

death row and death house both are nouns.

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

As nouns, death row and death house are synonyms defined as:

death row and death house: the cellblock in a prison where those condemned to death await execution

death row (noun)	death house (noun)
the cellblock in a prison where those condemned to death await execution	the cellblock in a prison where those condemned to death await execution