For sure, he can say:

• Mama
• Dada
• Dog
• Hot dog
• Up
• Bye-bye
• Fish
• Sock
• Shoe
• Hot
• Book

Have heard once or twice, never repeated since:

• Love you.
• Dellaina!
• Gumdrop
• Bailey
• K.Lo
• Snow
• No
• Mine
• Strawberry
• Pasta
• Shrimp
• Chip
• Blankie
• Go, go, go!
• Duck
• Quack
• Moo

The blended together sentences:

• I-want-that.
• I-like-that.
• Thank-you.
• I-go-up.

These all sound the same. Highly amusing: 

• Basketball
• Pom-pom
• Crockpot

Can’t say, but knows the meaning:

• Go get such-and-such item.
• Close the door/drawer/dishwasher.
• Put such-and-such back.
• Get down. 
• Climb up.
• Walk.
• Dance.
• Give me a kiss/hug.
• Brush your teeth.
• Hand over such-and-such item.
• Night-night.
• Banana
• Juice
• Cheese
• Bender
• Baby
• Good job!
• High five.

Understands, occasionally obeys!

• No.
• Don’t touch.