Beneath means below.
underneath or beneath
Beneath the skin.
yeah oil and gas BENEATH the sea i mean beneath the bottom.
As an adverb beneath means - below, in a lower place, underneath Beneath the festive mood there was an underlying apprehension.
the sunlight beneath the earth
The word means " beneath the sea"
under means below or beneath
to go beneath the surface of the earth.
"Under" means beneath something or someone.
The prefix "suf" means under, beneath, or below.
On prescriptions, it means sublingual (beneath the tongue).
If you mean prefix, it is hypo-.