ignition lock vs constraint

ignition lock and constraint both are nouns.

Word	Noun	Adjective	Verb	Adverb
ignition lock	Yes	No	No	No
constraint	Yes	No	No	No

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

ignition lock: a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key
constraint: a device that retards something's motion

Other hypernyms of ignition lock include restraint.

ignition lock (noun)	constraint (noun)
a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key	the act of constraining; the threat or use of force to control the thoughts or behavior of others
	a device that retards something's motion
	the state of being physically constrained