Answer
extreme greed for wealth or material gain. "he was rich beyond the dreams of avarice
Explanation:
av·a·rice
/ˈavərəs/
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noun
noun: avarice
The answer it the thesis. It explains what the entire essay will be about in one sentence.
It could be plausible because that is a synonym for credible and means seeming reasonable
The missing word is a verb.
Simply choose an appropriate verb that makes sense.
Examples:
placed
pushed
will move