airstrip vs airfield

airstrip and airfield both are nouns.

Word	Noun	Adjective	Verb	Adverb
airstrip	Yes	No	No	No
airfield	Yes	No	No	No

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

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

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