alphabetic vs abecedarian

alphabetic is not a noun while abecedarian is a noun.

Word	Noun	Adjective	Verb	Adverb
alphabetic	No	Yes	No	No
abecedarian	Yes	Yes	No	No

alphabetic (noun)	abecedarian (noun)
	a novice learning the rudiments of some subject

alphabetic (adjective)	abecedarian (adjective)
arranged in order according to the alphabet	alphabetically arranged (as for beginning readers)
relating to or expressed by a writing system that uses an alphabet