FET vs transistor

FET and transistor both are nouns.

Word	Noun	Adjective	Verb	Adverb
FET	Yes	No	No	No
transistor	Yes	No	No	No

As nouns, transistor is a hypernym of FET; that is, transistor is a word with a broader meaning than FET:

FET: a transistor in which most current flows in a channel whose effective resistance can be controlled by a transverse electric field
transistor: a semiconductor device capable of amplification

Other hypernyms of FET include electronic transistor, junction transistor.

FET (noun)	transistor (noun)
a transistor in which most current flows in a channel whose effective resistance can be controlled by a transverse electric field	a semiconductor device capable of amplification