image scanner vs input device

image scanner and input device both are nouns.

Word	Noun	Adjective	Verb	Adverb
image scanner	Yes	No	No	No
input device	Yes	No	No	No

As nouns, input device is a hypernym of image scanner; that is, input device is a word with a broader meaning than image scanner:

image scanner: an electronic device that generates a digital representation of an image for data input to a computer
input device: a device that can be used to insert data into a computer or other computational device

Other hypernyms of image scanner include data input device, electronic device.

image scanner (noun)	input device (noun)
an electronic device that generates a digital representation of an image for data input to a computer	a device that can be used to insert data into a computer or other computational device