Obsolete is an adjective.
Room is a noun.
It is the verb of the sentence in past tense.
The word "walking" is a gerund in this sentence, functioning as a noun to describe the action Bob is performing.
The word harmonic is an adjective in this sentence.
The word "everyone" is considered a pronoun in this sentence. Pronouns are used to replace nouns in a sentence.
The enuthusiastic speaker entered the room and gave his speech with ardor.
The word bedroom is a noun. It is a room with the purpose of sleeping in.
This baffle will soften the lighting in this part of the room.
"Cleaned" is the past tense or past participle form of the base verb "clean". As with all other verbs, the participle can function in a sentence as an adjective, as in the sentence "A cleaned gun makes a better impression than a poorly maintained one."
The very instant she left the room, I KNEW that I had been passionately used. Passionately is used fervently in a sentence. Please tone down your passionately presented speech.
"Book" functions as a verb in the phrase "book a room." It is an action that describes reserving or securing a room for a specific purpose or time period.
The word brother is a noun.