wing vs pennon

wing and pennon both are nouns.

Word	Noun	Adjective	Verb	Adverb
wing	Yes	No	Yes	No
pennon	Yes	No	No	No

As nouns, pennon is a hyponym of wing; that is, pennon is a word with a more specific, narrower meaning than wing:

Other hyponyms of wing include ala, fore-wing, fore wing, forewing, balancer, halter, haltere, pinion, elytron, wing case.

wing (noun)	pennon (noun)
a movable organ for flying (one of a pair)	wing of a bird
one of the horizontal airfoils on either side of the fuselage of an airplane	a long flag; often tapering
an addition that extends a main building
a barrier that surrounds the wheels of a vehicle to block splashing water or mud
a stage area out of sight of the audience
the wing of a fowl
a unit of military aircraft
the side of military or naval formation
a group within a political party or legislature or other organization that holds distinct views or has a particular function
(in flight formation) a position to the side and just to the rear of another aircraft
a hockey player stationed in a forward position on either side

wing (verb)	pennon (verb)
travel through the air; be airborne