ineptitude vs worthlessness

ineptitude and worthlessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
ineptitude	Yes	No	No	No
worthlessness	Yes	No	No	No

As nouns, ineptitude and worthlessness are synonyms defined as:

ineptitude and worthlessness: having no qualities that would render it valuable or useful

ineptitude (noun)	worthlessness (noun)
having no qualities that would render it valuable or useful	having no qualities that would render it valuable or useful
unskillfulness resulting from a lack of training	the quality of being without practical use