The word euphony comes from the Greek word meaning "good sound." ... The word euphony is itself slightly euphonic because of its soft sounds. Euphony is one of the words that is used most often to speak about the musicality of language—how it sounds when it's spoken aloud.

What is a soft sound called?

whisper. noun. literary a quiet gentle sound.

What are pleasant sounding words called?

Something euphonious sounds beautiful and pleasant. "You have a euphonious voice!" is a great compliment for a singer. This word sounds pretty when you say it, so it makes sense that it describes something pleasing to the ear. Most often, this word applies to music (probably not a heavy metal band, though).