trackball vs electronic device

trackball and electronic device both are nouns.

Word	Noun	Adjective	Verb	Adverb
trackball	Yes	No	No	No
electronic device	Yes	No	No	No

As nouns, electronic device is a hypernym of trackball; that is, electronic device is a word with a broader meaning than trackball:

trackball: an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen
electronic device: a device that accomplishes its purpose electronically

trackball (noun)	electronic device (noun)
an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen	a device that accomplishes its purpose electronically