(n.) One who undertakes enterprises.

a actor agent ancestors apprentice artificer artist author begetter beginner builder civil architect conceiver constructor contriver craftsman creator designer developer deviser discoverer doer effector engenderer engineer enterpriser entrepreneur executant executor executrix fabricator father founder framer generator grower inaugurator industrialist initiator instigator institutor introducer inventor journeyman landscape architect landscape gardener maker manufacturer master master craftsman medium mother mover operant operative operator organizer originator past master patriarch performer perpetrator planner practitioner precursor prime mover producer projector promoter raiser realizer shaper sire smith strategian strategist subject tactician urbanist worker wright