(n.) One who begins or originates anything. Specifically: A young or inexperienced practitioner or student; a tyro.

abecedarian agent alphabetarian ancestors apprentice architect articled clerk artificer artist author baby begetter boot builder catalyst catechumen causer colt conceiver constructor craftsman creator deb debutant designer deviser discoverer effector engenderer engineer entrant executor executrix father fledgling founder freshman generator greenhorn greeny grower ignoramus inaugurator inductee industrialist infant initiate initiator inspirer instigator institutor introducer inventor journeyman learner maker manufacturer master master craftsman mother mover neophyte nestling new boy newcomer novice novitiate organizer originator parent past master planner postulant precursor prime mover primum mobile probationer probationist producer raiser raw recruit realizer recruit rookie shaper sire smith tenderfoot trainee tyro wright