majuscule vs majuscular

majuscule is a noun but majuscular is not a noun.

Word	Noun	Adjective	Verb	Adverb
majuscule	Yes	Yes	No	No
majuscular	No	Yes	No	No

majuscule (noun)	majuscular (noun)
one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis

majuscule (adjective)	majuscular (adjective)
of or relating to a style of writing characterized by somewhat rounded capital letters; 4th to 8th centuries	of the nature of a majuscule or written in majuscules
uppercase