According to the Whorfian Theory, the structure of language shapes our ability to experience the World.
We on the other hand can see many different kinds of cars whereas the Eskimos probably would just sees a vehicle. There is more in the Notes on Whorfian Theory if you want more information.
No one would suggest that you can't see something without a name for it, but Vygotsky demonstrated that symbols do make things more recognizable and more resistant to figure-ground disturbances.
Hence, there is value in providing young children with many experiences which develop language and the parts of speech.
This is the value of a three hour, twice a week, pre-school program for the three and four-year old children. (Not to be confused, necessarily with day care centers whose job it is to provide a home away from home- a sad contradiction of terms).
NOTES: Here is a somewhat more in depth discussion of the Whorfian theory.