S: (n) assistant, helper, help, supporter (a person who contributes to the fulfillment of a need or furtherance of an effort or purpose) "my invaluable assistant"; "they hired additional help to finish the work"
S: (n) labor coach, birthing coach, doula, monitrice (an assistant (often the father of the soon-to-be-born child) who provides support for a woman in labor by encouraging her to use techniques learned in childbirth-preparation classes)
S: (n) underboss (an assistant or second-in-command to a chief (especially in a crime syndicate))
S: (n) model, poser (a person who poses for a photographer or painter or sculptor) "the president didn't have time to be a model so the artist worked from photos"
S: (n) paraprofessional (a trained worker who is not a member of a profession but who assists a professional)
S: (n) powder monkey (someone who carries explosives (as from the magazine to the guns on board a warship))
S: (n) pawn ((chess) the least powerful piece; moves only forward and captures only to the side; it can be promoted to a more powerful piece if it reaches the 8th rank)