daddy (often used as a catch-all word that means "something having to do with parents")
uh-oh (a constant refrain: she dropped her fork, I dropped a book, the squirrel she's watching dropped an acorn)
tea (repeated rapid-fire whenever she spots my mug)
teeth (sounds remarkably like tea: she just really likes to brush her teeth)
In addition, she uses signs for food, water, and all done; employs a sort of quizzical squeak to request things or ask what they are called, or otherwise get my attention; and shakes her head violently to signal no.
I look forward to the time when she will be able to articulate her thoughts, but for now, she communicates pretty well in her way.