Beneath is a preposition, which means that it is a word that indicates the relationship between a noun or pronoun and other words in a sentence.
An example would be: Beneath the table, there was a cat.
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Beneath is showing the relationship of the table and the cat; how far away they are from one another.
My red coat was beneath the blue coat in the pile. No type of work should be beneath anyone if they need a job.
Obviously in is not beneath you dignity to have someone else write this sentence for you.
more beneath, most beneath
The earth lay beneath a blanket of snow.
beneath
Under
Santa placed the gifts beneath the Christmas Tree. She hid he book beneath her bed.
In, on, above, and beneath can all be used as prepositions and adverbs.
He sat beneath the tree.There is very hot molten magma under the surface beneath your feet.
No beneath is a proposition. A phrase is two or three words not one word. beneath the waves - is a prepositional phrase.
Beneath.
beneath