My daughter is just a bit over two-years old and isn't saying many words yet. The words she does say are generally announcements, very deliberately pronounced and used for a specific purpose.
When she really wants to communicate, she uses a combination of sign language and vocalizations. I have to say, she does a much better job of getting her point across like this than most people do with words.
For example, using words I might say "That was huge!" and someone would understand that I meant something was larger than normal. But my daughter would use her vocalization that means "big", and exaggerate it quite a bit, and you'd know for certain the she was talking about something HUGE!
We tend to leave out the emotional aspect of communication when we use words, and that's such a big part of communication anything effectively.