Army vs Infantry

When to use each in English, with meaning, register, and examples.

Army

Top 1,000 (very common)A2noun

Infantry

Top 2,000 (common)
Most common: Army
 ArmyInfantry
Pronunciation🇬🇧 /["/ˈɑːmi/"]/🇺🇸 /["/ˈɑːrmi/"]/🇬🇧 //ˈɪnfəntri//🇺🇸 //ˈɪnˌfæntəri//
MeaningA group of soldiers who are trained to fight.Soldiers who fight on foot.
ExampleThe army defended the country against invasion.The infantry advanced through the dense forest.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 2,000 (common)
CEFR levelA2-
Part of speechnoun
Collocationsgreat, huge, large, have, enter, go into, gather, advance, march, captain, chief of staff, colonel, in the army, great, huge, large, have, enter, go into, gather, advance, march, captain, chief of staff, colonel, in the army, vast, veritable, small, create, employ, hire, army ofinfantry division, infantry battalion, infantry unit, light infantry
Antonymscivilian, non-militarycavalry, air force
Common mistakesConfused with 'military', which is broader than just 'army'., Using 'army's' incorrectly as a verb instead of a noun., Mixing up singular and plural forms, e.g., saying 'armies' when referring to one.Confusing with 'cavalry' - 'infantry' refers to foot soldiers, not mounted troops., Using 'infantry' as a collective singular ('the infantry is') instead of plural ('the infantry are').
Usage notesUse 'army' when talking about military forces. It is appropriate in formal contexts like discussions on defense or history, but may not be suitable in casual conversation about unrelated topics.Used mainly in military contexts. In informal settings, people may just say 'troops'.

See it in real clips

Army
Infantry

Frequently asked questions: Army vs Infantry

What's the difference between Army and Infantry?

Army: A group of soldiers who are trained to fight. Infantry: Soldiers who fight on foot.

Which is more common: Army and Infantry?

Army is the most common in everyday English.

Can you show an example of each?

Army: The army defended the country against invasion. Infantry: The infantry advanced through the dense forest.

Can I use Army and Infantry interchangeably?

Not always. Army and Infantry are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

Related comparisons