Astern and Hindmost

Astern adverb - Near, toward, or in the stern of a ship or the tail of an aircraft.

Hindmost and astern are semantically related. In some cases you can use "Hindmost" instead an adjective "Astern".

Hindmost adjective - Being at or in the part of something opposite the front part.

Astern and hindmost are semantically related. Sometimes you can use "Astern" instead an adjective "Hindmost".