clay pipe vs tobacco pipe

clay pipe and tobacco pipe both are nouns.

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

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

Other hypernyms of clay pipe include pipe.

clay pipe (noun)	tobacco pipe (noun)
a pipe made of clay	a tube with a small bowl at one end; used for smoking tobacco