Compound nouns that start with a?

Here are some compound nouns that start with the letter "a":

General:

* Air conditioner

* Air pollution

* Air pressure

* Air traffic

* Air travel

* Airplane

* Airport

* Assembly line

* Automatic teller machine (ATM)

Animals:

* Alligator

* Ant eater

* Antelope

* Armadillo

* Aardvark

Food and Drink:

* Apple pie

* Apple cider

* Apple sauce

* Asparagus

* Avocado toast

Other:

* Afternoon

* Aftershave

* Airplane

* Airport

* Armchair

* Artwork

* Armrest

* Arrowhead

* Aspirin

* Assistant

This is not an exhaustive list, as there are many compound nouns starting with "a".

Do you have a specific category in mind that you'd like to explore? Let me know and I can give you more examples!