semiconductor vs diode

semiconductor and diode both are nouns.

Word	Noun	Adjective	Verb	Adverb
semiconductor	Yes	No	No	No
diode	Yes	No	No	No

As nouns, diode is a hyponym of semiconductor; that is, diode is a word with a more specific, narrower meaning than semiconductor:

semiconductor (noun)	diode (noun)
a conductor made with semiconducting material	a semiconductor that consists of a p-n junction
a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities	a thermionic tube having two electrodes; used as a rectifier