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.
The part of speech for this particular word is a noun.
part of speech
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 "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.