hubbly-bubbly vs tobacco pipe

hubbly-bubbly and tobacco pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
hubbly-bubbly	Yes	No	No	No
tobacco pipe	Yes	No	No	No

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

hubbly-bubbly: 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 hubbly-bubbly include pipe.

hubbly-bubbly (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