formal vs titular

formal is a noun but titular is not a noun.

Word	Noun	Adjective	Verb	Adverb
formal	Yes	Yes	No	No
titular	No	Yes	No	No

formal (noun)	titular (noun)
a gown for evening wear
a lavish dance requiring formal attire

formal (adjective)	titular (adjective)
being in accord with established forms and conventions and requirements (as e.g. of formal dress)	of or associated with or bearing a title signifying nobility
(of spoken and written language) adhering to traditional standards of correctness and without casual, contracted, and colloquial forms	of or pertaining to the title of a work of art
refined or imposing in manner or appearance; befitting a royal court	of or bearing a title signifying status or function
logically deductive	of or relating to a legal title to something
represented in simplified or symbolic form	existing in name only
characteristic of or befitting a person in authority