embarrassment, exorbitance, extravagance, extravagancy, outrageousness, overplus, plethora, superfluity.
Your query has returned 123 words, which include anagrams of excessivenesses as well as other shorter words that can be made using the letters included in excessivenesses.
The words in this list can be used in games such as Scrabble, Words with Friends, Wordscapes and other similar games.