ridgepole vs rooftree

ridgepole and rooftree both are nouns.

Word	Noun	Adjective	Verb	Adverb
ridgepole	Yes	No	No	No
rooftree	Yes	No	No	No

As nouns, ridgepole and rooftree are synonyms defined as:

ridgepole and rooftree: a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters

Other synonyms of ridgepole include ridge.

ridgepole (noun)	rooftree (noun)
a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters	a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters