pipe of peace vs tobacco pipe

pipe of peace and tobacco pipe both are nouns.

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

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

pipe of peace: 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 pipe of peace include pipe.

pipe of peace (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