1.  beginner(n = noun.person) initiate, novice, tiro, tyro - someone new to a field or activity;
is a kind of unskilled person
has particulars: abecedarian, apprentice, learner, prentice, cub, greenhorn, rookie, landlubber, landsman, lubber, entrant, fledgeling, fledgling, freshman, neophyte, newbie, newcomer, starter, tenderfoot, trainee
Derived form verb begin₁

2.  beginner(n = noun.person) father, founder, founding father - a person who founds or establishes some institution; "George Washington is the father of his country"
is a kind of conceiver, mastermind, originator
has particulars: cofounder, coloniser, colonizer, foundress
Derived form verb begin₃

   One who begins or originates anything. Specifically: A young or inexperienced practitioner or student; a tyro. [1913 Webster]
"A sermon of a new beginner." [1913 Webster]

beginner, n. a person just beginning to learn a skill etc.

Idiom:
beginner's luck good luck supposed to attend a beginner at games etc.

N  learner, scholar, student, pupil, apprentice, prentice, journeyman, articled clerk, beginner, tyro, amateur, rank amateur, abecedarian, alphabetarian, alumnus, eleve, recruit, raw recruit, novice, neophyte, inceptor, catechumen, probationer, seminarian, chela, fellow-commoner, debutant, intern, resident, schoolboy, fresh, freshman, frosh, junior soph, junior, senior soph, senior, sophister, sophomore, questionist, undergraduate, graduate student, law student, medical student, pre-med, post-doctoral student, post-doc, matriculated student, part-time student, night student, auditor, class, grade, seminar, form, remove, pupilage, disciple, follower, apostle, proselyte, fellow-student, condisciple, school, in statu pupillari, in leading strings, practise makes perfect.