landing strip vs airstrip

landing strip and airstrip both are nouns.

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

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

landing strip and airstrip: an airfield without normal airport facilities

Other synonyms of landing strip include flight strip, strip.

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