battlegroup

As a proper noun fleet

is the stream that ran where fleet street now runs.

As a noun battlegroup is

(military) a grouping of several types of troops assembled to fight together.

As nouns the difference between fight and battlegroup

is that fight is an occasion of fighting while battlegroup is (military) a grouping of several types of troops assembled to fight together.

As a verb fight

is (label) to contend in physical conflict, either singly or in war, battle etc.

In military|lang=en terms the difference between troop and battlegroup

is that troop is (military) a small unit of cavalry or armour commanded by a captain, corresponding to a platoon or company of infantry while battlegroup is (military) a grouping of several types of troops assembled to fight together.

As nouns the difference between troop and battlegroup

is that troop is a collection of people; a company; a number; a multitude while battlegroup is (military) a grouping of several types of troops assembled to fight together.

As a verb troop

is to move in numbers; to come or gather in crowds or troops.