briar pipe vs pipe

briar pipe and pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
briar pipe	Yes	No	No	No
pipe	Yes	No	Yes	No

As nouns, pipe is a hypernym of briar pipe; that is, pipe is a word with a broader meaning than briar pipe:

Other hypernyms of briar pipe include tobacco pipe.

briar pipe (noun)	pipe (noun)
a pipe made from the root (briarroot) of the tree heath	a long tube made of metal or plastic that is used to carry water or oil or gas etc.
	a tube with a small bowl at one end; used for smoking tobacco
	the flues and stops on a pipe organ
	a tubular wind instrument
	a hollow cylindrical shape