Answer:
When he talks about duties, he talks about how he is willing to help Macbeth due to his respect to him, however, Banquo also knows that Macbeth may have done something terrible in order to become king so he also could be saying that it is his duty to stop Macbeth from committing any more crimes.
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Annihilate and decimate both mean to destroy something or someone, but annihilate means to destroy something as a whole, and at a bigger scale, while decimate doesn't have to mean destroying the whole thing.
Eradicate and massacre are both violent words with the intent to convey destruction, but eradicate is a more general term, as massacre is meant to simple destroy/kill a large group of people.
