landing skid vs landing gear

landing skid and landing gear both are nouns.

Word	Noun	Adjective	Verb	Adverb
landing skid	Yes	No	No	No
landing gear	Yes	No	No	No

As nouns, landing gear is a hypernym of landing skid; that is, landing gear is a word with a broader meaning than landing skid:

landing skid: one of two parts of the landing gear of a helicopter
landing gear: an undercarriage that supports the weight of the plane when it is on the ground

landing skid (noun)	landing gear (noun)
one of two parts of the landing gear of a helicopter	an undercarriage that supports the weight of the plane when it is on the ground