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Could someone explain me the difference between sell and sale?
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One is a verb, one a noun.

http://www.m-w.com/dictionary/sell (The verb)

http://www.m-w.com/dictionary/sale (The noun)
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Grammar GeekOne is a verb, one a noun.

http://www.m-w.com/dictionary/sell (The verb)

http://www.m-w.com/dictionary/sale (The noun)

Ok, thank you.

But, `sell' is also noun in the dictionary.

is it right?
Well, yes, but in contexts such as "a hard sell" (a high-pressure sales talk). For MOST purposes of an English learner, consider sell the verb to start with.