There is an Administration Bond for a probate, signed on 14 Jun 1717, by Thomas Mason, son of Thomas and Abigail Mason, apparently deceased closely enough in time to have a joint probate. Thomas died intestate and this is the only document surviving in his online probate file:
Essex County, MA: Probate File Papers, 1638-1881, #17976 (on AmericanAncestors.org)
Thomas, the son, is described as a "sayler," in this document. Since his sureties had land-bound occupations (a cooper and a yeoman), I'm hoping this means he made sails, not that he used them as what we would call a "sailor."
The term I've seen in contemporary documents for someone who sailed on a boat/ship is "mariner." Googling for a definition hasn't helped, since it turned up only a type of boat and the name, Sayler, plus the information that it can be an alternative spelling of "sailor" (which, given the vagaries of 17th/18th-century spelling, I'd already guessed).
Does anyone happen to know whether sail makers were once called "sailers"? (Saddle makers are, even today, called "saddlers".....)