peace pipe vs tobacco pipe

peace pipe and tobacco pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
peace pipe	Yes	No	No	No
tobacco pipe	Yes	No	No	No

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

peace pipe: a highly decorated ceremonial pipe of Amerindians; smoked on ceremonial occasions (especially as a token of peace)
tobacco pipe: a tube with a small bowl at one end; used for smoking tobacco

Other hypernyms of peace pipe include pipe.

peace pipe (noun)	tobacco pipe (noun)
a highly decorated ceremonial pipe of Amerindians; smoked on ceremonial occasions (especially as a token of peace)	a tube with a small bowl at one end; used for smoking tobacco