airstrip vs landing strip

airstrip and landing strip both are nouns.

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

As nouns, airstrip and landing strip are synonyms defined as:

airstrip and landing strip: an airfield without normal airport facilities

Other synonyms of airstrip include flight strip, strip.

airstrip (noun)	landing strip (noun)
an airfield without normal airport facilities	an airfield without normal airport facilities