birchbark canoe vs birchbark

birchbark canoe and birchbark both are nouns.

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

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

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

Other synonyms of birchbark canoe include birch bark.

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