Choose the word which is different from the rest.

Admiral
Colonel
Captain
Commodore E. Lieutenant

The answer is E, Lieutenant.

A, B, C, and D are all military ranks, while E is not.

An admiral is a high-ranking naval officer. A colonel is a high-ranking army officer. A captain is a high-ranking naval or air force officer. A commodore is a naval officer ranking above a captain but below a rear admiral. A lieutenant is a junior-grade commissioned officer in the armed forces.