The term 'MONSTER Mass' can be broken down into two words, 'HORDE' and 'MONSTER'. The word 'HORDE' is a noun that refers to a large group of people or animals. It is derived from the Turkish word 'ordu', which means army. The word 'MONSTER' is an adjective that describes something that is huge, frightening, or dangerous. Together, these two words describe a large group of creatures that are both intimidating and dangerous.