Kaden's growing vocabulary

Kaden's got a new word today.  I won't reveal it just yet, but give you time to guess.  I am please that finally he is adding some words to his repertoire because for a while it seemed that "ball" might be his only word ever, however I'm not so sure this latest word is a great addition.

Words that he says regularly now:  (he sometimes busts out a word or two one day and we never hear it again- baby is an example of this.  Its as if he never knew it.  Puppy & cup also seems to have been lost from his vocabulary.  He is a man of few words, so maybe he had to weed some out to make room for others.

Ball

Truck

Ma-ee

Da-ee

Go go

Bye

Um (come- which include a hand motion as well)

eeese (cheese- whenever he sees a camera)

ot (Hot- when referring to the wood stove & hot food- which he then blows/spits on)

And as of today... Bum and/or Bum-bum.  It sounds similar to ball but when used in context the difference is pretty clear.