The phrase "sounds horn" refers to the act of emitting a loud noise using a horn or similar device. There are several synonyms for this phrase, including honks, beeps, blares and toots. Each of these words describes a specific type of sound or volume, and can be used in different contexts. For example, a car may "honk" its horn to alert someone of its presence, while a train may "blast" its horn to signal its departure. Additionally, the word "siren" is often used to describe a loud, wailing sound that is similar to the sound of a horn. Overall, there are many different words that can be used to describe the act of producing a loud noise with a horn or similar device.