Ais forArmy

Photo of an army of caterpillars

A is for Army (Caterpillar)

Collective nouns
A group of caterpillars is called an army. Sometimes a group of ants is called an army too.
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Franco Folini / CC BY-SA
Photo of soldiers

A is for Army (Military)

Military
The Army is the military forces of a particular country. The Army is usually distinct from the Navy or the Air Force.
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DVIDS / Public domain