outing vs excursion

outing and excursion both are nouns.

Word	Noun	Adjective	Verb	Adverb
outing	Yes	No	No	No
excursion	Yes	No	No	No

As nouns, outing and excursion are synonyms defined as:

Other synonyms of outing include expedition, jaunt, junket, pleasure trip, sashay.

outing (noun)	excursion (noun)
a journey taken for pleasure	a journey taken for pleasure
a day devoted to an outdoor social gathering	wandering from the main path of a journey