airstrip vs flying field

airstrip and flying field both are nouns.

Word	Noun	Adjective	Verb	Adverb
airstrip	Yes	No	No	No
flying field	Yes	No	No	No

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

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

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