An excessive amount is an amount that is greater than what is necessary or expected. The term can be used to describe a variety of things, such as money, time, or resources. Two words that can be used to describe an excessive amount are 'SPATE' and 'UNDUE'. SPATE is defined as a sudden, large increase in something, while UNDUE is defined as being more than is necessary or appropriate. Therefore, both words can be used to describe an excessive amount.