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No speaker of English knows all 472,000 entries in Webster’s Third New International Dictionary. And even if someone did know all the words in Webster’s, that person would still not know English. Imagine trying to learn a foreign language by buying a dictionary and memorizing words.
No matter how many words you learned, you would not be able to form the simplest phrases or sentences in the language, or understand a native speaker. No one speaks in isolated words. Of course, you could search in your traveler’s dictionary for individual words to find out how to say something like “car-gas-where?” After many tries, a native might understand this question and then point in the direction of a gas station. If he answered you with a sentence, however, you probably would not understand what was said or be able to look it up, because you would not know where one word ended and another began.
"An Introduction to Language"
Victoria Fromkin
