landing strip vs airfield

landing strip and airfield both are nouns.

Word	Noun	Adjective	Verb	Adverb
landing strip	Yes	No	No	No
airfield	Yes	No	No	No

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

Other hypernyms of landing strip include field, flying field, landing field.

landing strip (noun)	airfield (noun)
an airfield without normal airport facilities	a place where planes take off and land