restraint vs dive brake

restraint and dive brake both are nouns.

Word	Noun	Adjective	Verb	Adverb
restraint	Yes	No	No	No
dive brake	Yes	No	No	No

As nouns, dive brake is a hyponym of restraint; that is, dive brake is a word with a more specific, narrower meaning than restraint:

restraint: a device that retards something's motion
dive brake: a small parachute or articulated flap to reduce the speed of an aircraft

restraint (noun)	dive brake (noun)
the act of controlling by restraining someone or something	a small parachute or articulated flap to reduce the speed of an aircraft
a device that retards something's motion
discipline in personal and social activities
lack of ornamentation
a rule or condition that limits freedom
the state of being physically constrained