excursus vs aside

excursus and aside both are nouns.

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

As nouns, excursus and aside are synonyms defined as:

Other synonyms of excursus include digression, divagation, parenthesis.

excursus (noun)	aside (noun)
a message that departs from the main subject	a line spoken by an actor to the audience but not intended for others on the stage
	a message that departs from the main subject

excursus (adverb)	aside (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