The term 'inner workings' refers to the internal components of something, such as a machine or an organization. The two crossword solutions for this term are 'GUTS' and 'CORE'. GUTS is a slang term that refers to the essential parts of something, while CORE is a more technical term that refers to the central or innermost part of something. Together, these two words can be used to describe the inner workings of a system or entity.