hubble-bubble vs tobacco pipe

hubble-bubble and tobacco pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
hubble-bubble	Yes	No	No	No
tobacco pipe	Yes	No	No	No

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

hubble-bubble: an oriental tobacco pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water
tobacco pipe: a tube with a small bowl at one end; used for smoking tobacco

Other hypernyms of hubble-bubble include pipe.

hubble-bubble (noun)	tobacco pipe (noun)
an oriental tobacco pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water	a tube with a small bowl at one end; used for smoking tobacco