One word for 'killing a large number of people' (genocide)

The same question, asked 2 times: 20 Jul 2023 S4*, 26 Jul 2023 S2. Every wording below, oldest first.

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Question 1
20 Jul 2023 S4
87 $Select the word which means the same as the group of words underlined in the given sentence. By killing a large number of people, they thought they would get more benefits of the schemes.$
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Question 2
26 Jul 2023 S2
77 $Select the option that can be used as a one-word substitute for the given group of words. The murder of a large number of people from a particular nation or ethnic group.$
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Question 1