aside vs message

aside and message both are nouns.

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

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

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

aside (noun)	message (noun)
a line spoken by an actor to the audience but not intended for others on the stage	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

aside (adverb)	message (adverb)
on or to one side
out of the way (especially away from one's thoughts)
in reserve; not for immediate use
not taken into account or excluded from consideration
placed or kept separate and distinct as for a purpose
in a different direction