light pen vs electronic stylus

light pen and electronic stylus both are nouns.

Word	Noun	Adjective	Verb	Adverb
light pen	Yes	No	No	No
electronic stylus	Yes	No	No	No

As nouns, light pen and electronic stylus are synonyms defined as:

light pen and electronic stylus: (computer science) a pointer that when pointed at a computer display senses whether or not the spot is illuminated

light pen (noun)	electronic stylus (noun)
(computer science) a pointer that when pointed at a computer display senses whether or not the spot is illuminated	(computer science) a pointer that when pointed at a computer display senses whether or not the spot is illuminated