"In phonaesthetics, the English compound noun cellar door (especially in its British pronunciation) has been cited variously as an example of a word or phrase which is beautiful purely in terms of its sound, without regard for semantics.” - Wikipedia
I came across mention of “Cellar door” possessing this quality when I first saw Donnie Darko. I was with a friend of mine at the time and while I don’t recall exactly what I said to him, I do remember disagreeing. Without a suitable alternative however, I forgot about it and moved on.
Today while I was just thinking of a few of my favourite words (like “milk”, “salacious” and “lovely”) I found it. A word one would hardly describe as beautiful but it is. To me at least. Not in it’s definition but in the way it’s spoken and expressed. When people speak it in context, the emotion is always clear. A word I think is so lovely that you can basically taste its beauty as you say it.