you are likely to find Voice in/at/on Radio. you are likely to find Radio in/at/on Bedroom. Bedroom is related to Alarm. 
Front is a synonym of Presence. Presence is a type of Spirit. Spirit is a synonym of Potential. Potential is the opposite of Real. 
Voice --AtLocation--> Radio --AtLocation--> Bedroom <--RelatedTo--> Alarm 
Front <--Synonym--> Presence --IsA--> Spirit <--Synonym--> Potential <--Antonym--> Real 