pipe vs tube

pipe and tube both are nouns.

Word	Noun	Adjective	Verb	Adverb
pipe	Yes	No	Yes	No
tube	Yes	No	Yes	No

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

pipe: a long tube made of metal or plastic that is used to carry water or oil or gas etc.
tube: conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases

Other hypernyms of pipe include tubing.

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

pipe: a tube with a small bowl at one end; used for smoking tobacco
tube: conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases

Other hypernyms of pipe include tubing.

As nouns, pipe and tube are synonyms defined as:

pipe (noun)	tube (noun)
a long tube made of metal or plastic that is used to carry water or oil or gas etc.	conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
a tube with a small bowl at one end; used for smoking tobacco	an electric railway operating below the surface of the ground (usually in a city)
the flues and stops on a pipe organ	electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
a tubular wind instrument	(anatomy) any hollow cylindrical body structure
a hollow cylindrical shape	a hollow cylindrical shape

pipe (verb)	tube (verb)
utter a shrill cry	place or enclose in a tube
play on a pipe	convey in a tube
trim with piping	ride or float on an inflated tube
transport by pipeline	provide with a tube or insert a tube into