carbon nanotube vs nanotube

carbon nanotube and nanotube both are nouns.

Word	Noun	Adjective	Verb	Adverb
carbon nanotube	Yes	No	No	No
nanotube	Yes	No	No	No

As nouns, carbon nanotube and nanotube are synonyms defined as:

carbon nanotube and nanotube: a fullerene molecule having a cylindrical or toroidal shape

carbon nanotube (noun)	nanotube (noun)
a fullerene molecule having a cylindrical or toroidal shape	a fullerene molecule having a cylindrical or toroidal shape