Some one already said it but i will agree with them and repeat it as ameans of giving strenght to their answer through numbers living and dinning are both verbs and pretain to what is done in the room bedroom is a type of room characterized by the bed if you were to call it a sleeping room it would be two words bathroom is the same but wash room is two words if their is a verb.
Guest room one word or two.
When in doubt use the hyphenate as it s in.
Depending on how common they are.
A guest room is a bedroom in a house or hotel for visitors or guests to sleep in.
Synonyms for guest room include spare room bedroom boudoir chamber cubicle dorm dormitory room bedchamber and bunk room.
Frankly the right answer may only be right this year.
Meaning pronunciation translations and examples.
Next year it could have evolved.
Common phrases like that evolve from being two words.
A bedroom in a house for visitors to sleep in.
Top synonyms for guest room other words for guest room are guestroom spare room and in the guest bedroom.