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Clean is the opposite of dirty. Clear means transparent or unclouded: clear water, a clear sky.
Less denotes amount, quantity, value, or degree, fewer denotes number. We may have less water, less food, less money, less education, but fewer books, fewer letters, fewer friends.
We say less than (five, six, etc.) pounds because the pounds are considered as a sum of money and not as a number of coins.
Little means not much and emphasises the smallness of the amount. It's distinguished from a little which means at least some.
To be ill means to be in bad health. To be sick means to vomit. We sometimes use sick idiomatically to mean feeling ill. The smell made me sick.
We can also use sick before certain nouns: The sick room, a sick note, sick leave. We use the plural noun the sick to mean ill people: Angela worked with the sick on the streets of Birmingham.