army

A large, highly organized military force, concerned mainly with ground (rather than air or naval) operations.

“The army was sent in to quell the uprising.”

The governmental agency in charge of a state's army.

“The army opposed the legislature's involvement.”

A large group of people working toward the same purpose.

“It took an army of accountants to uncover the fraud.”

A large group of social animals working toward the same purpose.

“Our house is being attacked by an army of ants.”

Any multitude.

“There was an army of construction cranes working on building the skyscraper.”