constraint vs device

constraint and device both are nouns.

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

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

constraint (noun)	device (noun)
the act of constraining; the threat or use of force to control the thoughts or behavior of others	any clever maneuver
a device that retards something's motion	an instrumentality invented for a particular purpose
the state of being physically constrained	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