Is strategy a noun verb adjective adverb or a preposition?

Answer 1

It is a noun. The adjective form is Strategic. The verb form is to Strategise, which is a modern verb and began heavy use in the latter half of the last century. It can never be a preposition, unless you're very imaginative and even then it would just be considered poor English.

I was shot by the commander, so I violently ran strategy him.

That's my feeble attempt, and as you can see it could never really work.

Answer 2

Strategy is a noun. It is a plan of action or a method used to achieve a specific goal.