hubble-bubble vs water pipe

hubble-bubble and water pipe both are nouns.

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

As nouns, hubble-bubble and water pipe are synonyms defined as:

hubble-bubble and water pipe: an oriental tobacco pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water

Other synonyms of hubble-bubble include calean, chicha, hookah, hubbly-bubbly, kalian, narghile, nargileh, sheesha, shisha.

hubble-bubble (noun)	water pipe (noun)
an oriental tobacco pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water	an oriental tobacco pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water