What type of noun is airforce?

The noun air force is a singular, common, compound, abstract noun.

The noun air force is an open spaced compound noun.

The noun air force is a common noun, a Word for any air force of any kind, anywhere.

A proper noun is the name of a specific person, place, or thing; for example:

• United States Air Force
• Chilean Air Force (La Fuerza Aérea de Chile)
• Philippine Air Force (Fuerza Aérea de Filipinas)
• Swedish Air Force (Svenska Flygvapnet)