beginner vs begin

beginner is a noun but begin is not a noun.

Word	Noun	Adjective	Verb	Adverb
beginner	Yes	No	No	No
begin	No	No	Yes	No

beginner (noun)	begin (noun)
someone new to a field or activity
a person who founds or establishes some institution

beginner (verb)	begin (verb)
	take the first step or steps in carrying out an action
	set in motion, cause to start
	begin to speak or say
	begin to speak, understand, read, and write a language
	achieve or accomplish in the least degree, usually used in the negative
	begin an event that is implied and limited by the nature or inherent function of the direct object
	have a beginning, in a temporal, spatial, or evaluative sense
	be the first item or point, constitute the beginning or start, come first in a series
	have a beginning characterized in some specified way
	have a beginning, of a temporal event