hipped roof vs hip roof

hipped roof and hip roof both are nouns.

Word	Noun	Adjective	Verb	Adverb
hipped roof	Yes	No	No	No
hip roof	Yes	No	No	No

As nouns, hipped roof and hip roof are synonyms defined as:

hipped roof and hip roof: a roof having sloping ends as well as sloping sides

hipped roof (noun)	hip roof (noun)
a roof having sloping ends as well as sloping sides	a roof having sloping ends as well as sloping sides