light-emitting diode vs LED

light-emitting diode and LED both are nouns.

Word	Noun	Adjective	Verb	Adverb
light-emitting diode	Yes	No	No	No
LED	Yes	No	No	No

As nouns, light-emitting diode and LED are synonyms defined as:

light-emitting diode and LED: diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used

light-emitting diode (noun)	LED (noun)
diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used	diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used