The term 'FUNCTION AS' can be broken down into two words, 'FUNCTION' and 'AS'. FUNCTION is a noun that refers to the action or purpose of something, while 'AS' is a preposition that is used to indicate a comparison or a role. In this context, the term 'FUNCTION AS' suggests that something is being used for a specific purpose or in a certain role. This could refer to a person, object, or concept. For example, a person might 'FUNCTION AS' a teacher, or an object might 'FUNCTION AS' a tool.