Beneath and Subaqueous

Beneath adverb - In or to a lower place.

Subaqueous and beneath are semantically related In some cases you can use "Subaqueous" instead an adjective "Beneath".

Subaqueous adjective - Growing or remaining under water.

Beneath and subaqueous are semantically related in usually down topic. Sometimes you can use "Beneath" instead an adjective "Subaqueous".