A long time ago a word was created to identify a particular action, person, place, or thing. Over time, the meaning of that word altered, and new words with similar meanings came into being also. Culture and language are interdependent. This is why two people raised in different cultures are likely to interpret certain words differently. Of course, the greatest barrier between any two cultures is called "temporal proximity," or the relation of time between two things.

For example, let's take the word, "nigger," which is a derivative of the word "negro" (Sort of like how "burger" is to "hamburger"). Without arguing from etymology too much, the word essentially means "black" or "black people," but in the 1800's in America it became a derogatory term assigned to black people. This is an example of culture creating a language. Because there was slavery and racism and whatnot, the word, "nigger" was used to identify slaves and racial targets.

Now, look at the modern usage of the word. It is used among black Americans as a term of endearment, "What's up, nigga?" (still a derivative of the word, "negro"). It is used in popular music all the time, in movies, classrooms, households, pretty much everywhere. Of course, there is still the 'hateful' permutation of the word in use, but this is in reality only used by a very small proportion of the American population. The new interpretation, "nigga," is an example of language creating a culture. Through the barrier of time, one word traveled into a new world and spawned a culture of, not hate, but of black solidarity.

So, there you have it. An example of culture creating a word, and an example of a word creating culture. All derived from the same root. Again, culture and language are interdependent, and it is not proper to say that one depends on the other completely.