airspeed vs velocity

airspeed and velocity both are nouns.

Word	Noun	Adjective	Verb	Adverb
airspeed	Yes	No	No	No
velocity	Yes	No	No	No

As nouns, velocity is a hypernym of airspeed; that is, velocity is a word with a broader meaning than airspeed:

airspeed: the speed of an aircraft relative to the air in which it is flying
velocity: distance travelled per unit time

Other hypernyms of airspeed include speed.

airspeed (noun)	velocity (noun)
the speed of an aircraft relative to the air in which it is flying	distance travelled per unit time