The word bedroom is a noun. It is a room with the purpose of sleeping in.
"Downstairs" can be an adverb, an adjective, or a noun: (as adverb) We went downstairs. (as adjective) This house has a downstairs bedroom. (as noun) The downstairs is flooded.
The bedroom is the scene, and the bed is (part of) the scenery.
My grandiose style of writing will serve to embellish, in a sentence, my essay. My editor told me to embellish the story a bit.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
The part of speech of "came" is a verb.