gambrel roof vs gambrel

gambrel roof and gambrel both are nouns.

Word	Noun	Adjective	Verb	Adverb
gambrel roof	Yes	No	No	No
gambrel	Yes	No	No	No

As nouns, gambrel roof and gambrel are synonyms defined as:

gambrel roof and gambrel: a gable roof with two slopes on each side and the lower slope being steeper

gambrel roof (noun)	gambrel (noun)
a gable roof with two slopes on each side and the lower slope being steeper	a gable roof with two slopes on each side and the lower slope being steeper