Air base and Airstrip

Air base noun - A base for military aircraft.

Airstrip and air base are semantically related In some cases you can use "Airstrip" instead a noun phrase "Air base".

Airstrip noun - An airfield without normal airport facilities.

Air base and airstrip are semantically related in runway for aircraft topic. You can use "Air base" instead a noun "Airstrip", if it concerns topics such as airplane landing area.