The word "tactic" was first used in English in the 16th century. It is derived from the Greek word "taktikos," which means "pertaining to arrangement." The word "tactic" originally referred to the art of arranging troops in battle, but it has since been extended to refer to any kind of strategic plan or action.
The word "tactical" is derived from the word "tactic." It means "relating to tactics or the art of arranging troops in battle." The word "tactical" is often used to describe something that is designed to be effective in a specific situation. For example, a "tactical nuclear weapon" is a nuclear weapon that is designed to be used in a specific military operation, rather than as a strategic deterrent.