What concepts do chimpanzees understand?

I have heard that a chimpanzee has the mental development of a two year old. Two year olds understand a fair amount and I wonder if that is really true. Have chimpanzees or other primates been taught to be able to use abstract words such as the following:

Male and female
Family members (mother, father, sibling)
Night and day
Big and small
Few and many
Wet and dry
Hungry, thirsty
Hot, cold
Plant, animal