Verified answer

No. "Greedilys" in your sentence is not functioning as an adverb but as a noun representing the amount of times greedily is used. For example, replace greedily with any other word be it noun, adjective, verb, etc

You can have seven [dogs] in a sentence

............seven [blues] in a sentence

............seven [goes'] in a sentence.

As you can see, goes is not functioning as a verb, nor is blue functioning as an adjective.

No. Her example may work for informal spoken English, but Scrabble is based on proper language.

The correct way to phrase her example would have been, "You can have seven instances of the word "greedily" in a sentence." Or, "The word "greedily" can appear seven times in a sentence."

NO!!!! u can not pluralize adverbs or adjectives in english language. only nouns