scratcher vs device

scratcher and device both are nouns.

Word	Noun	Adjective	Verb	Adverb
scratcher	Yes	No	No	No
device	Yes	No	No	No

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

scratcher (noun)	device (noun)
a device used for scratching	any clever maneuver
a person who scratches to relieve an itch	an instrumentality invented for a particular purpose
a workman who uses a tool for scratching	an emblematic design (especially in heraldry)
	any ornamental pattern or design (as in embroidery)
	something in an artistic work designed to achieve a particular effect