The term 'UMPS' CALLS' refers to the calls made by umpires during a baseball game. Umpires are responsible for making decisions on the field, such as whether a pitch is a ball or a strike, and whether a runner is safe or OUT. The two crossword solutions, OUTS (4 letters) and LETS (4 letters), refer to the two types of calls that an umpire can make. An OUT call is when an umpire declares a runner OUT, while a LET call is when an umpire allows a play to continue.