birchbark vs birchbark canoe

birchbark and birchbark canoe both are nouns.

Word	Noun	Adjective	Verb	Adverb
birchbark	Yes	No	No	No
birchbark canoe	Yes	No	No	No

As nouns, birchbark and birchbark canoe are synonyms defined as:

birchbark and birchbark canoe: a canoe made with the bark of a birch tree

Other synonyms of birchbark include birch bark.

birchbark (noun)	birchbark canoe (noun)
a canoe made with the bark of a birch tree	a canoe made with the bark of a birch tree