peace pipe vs pipe of peace

peace pipe and pipe of peace both are nouns.

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

As nouns, peace pipe and pipe of peace are synonyms defined as:

peace pipe and pipe of peace: a highly decorated ceremonial pipe of Amerindians; smoked on ceremonial occasions (especially as a token of peace)

Other synonyms of peace pipe include calumet.

peace pipe (noun)	pipe of peace (noun)
a highly decorated ceremonial pipe of Amerindians; smoked on ceremonial occasions (especially as a token of peace)	a highly decorated ceremonial pipe of Amerindians; smoked on ceremonial occasions (especially as a token of peace)