Does "scores of" refer to "a lot of"? Also, where is "scores of" used? on countable nouns or uncountable nouns?

Rebecca

Indeed! One of the definitions of "scores" does in fact mean a lot of people or things. "Scores" would be considered an uncountable noun since it is referring to a large group of people. It's not commonly used in American English, but it might be more commonly used in British English. Ex: Large scores of people attended the concert. Ex: Scores of women were at the retreat. Thanks for your question!