Mover or Shaker is a term used to describe someone who has a great influence on their environment and is able to make things happen. The two crossword solutions for this term are MUSCLE (6 letters) and DOER (4 letters). MUSCLE refers to someone who is strong and capable of physical labor, while DOER implies someone who is active and takes action. Both of these terms can be used to describe someone who is a Mover or Shaker, as they are both capable of making things happen.