transistor vs FET

transistor and FET both are nouns.

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

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

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

Other hyponyms of transistor include field-effect transistor, p-n-p transistor.

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