field-effect transistor vs FET

field-effect transistor and FET both are nouns.

Word	Noun	Adjective	Verb	Adverb
field-effect transistor	Yes	No	No	No
FET	Yes	No	No	No

As nouns, field-effect transistor and FET are synonyms defined as:

field-effect transistor and FET: a transistor in which most current flows in a channel whose effective resistance can be controlled by a transverse electric field

field-effect transistor (noun)	FET (noun)
a transistor in which most current flows in a channel whose effective resistance can be controlled by a transverse electric field	a transistor in which most current flows in a channel whose effective resistance can be controlled by a transverse electric field