parenthesis vs message

parenthesis and message both are nouns.

Word	Noun	Adjective	Verb	Adverb
parenthesis	Yes	No	No	No
message	Yes	No	Yes	No

As nouns, message is a hypernym of parenthesis; that is, message is a word with a broader meaning than parenthesis:

Other hypernyms of parenthesis include content, subject matter, substance.

parenthesis (noun)	message (noun)
either of two punctuation marks (or) used to enclose textual material	content communicating a message; what something is about
a message that departs from the main subject	a communication (usually brief) that is written or spoken or signaled