Great numbers are terms used to describe large amounts of something. The crossword solutions for the term 'great numbers' are myriads (7 letters), slews (5 letters), and LEGIONS (7 letters). Myriads refer to an extremely large number, usually of people or things, that is too great to be counted. Slews is a slang term for a large number of something, often used in a negative context. Lastly, LEGIONS refer to a large group of people, usually soldiers, that are organized and ready for battle.