incident vs sideshow

incident and sideshow both are nouns.

Word	Noun	Adjective	Verb	Adverb
incident	Yes	Yes	No	No
sideshow	Yes	No	No	No

As nouns, sideshow is a hyponym of incident; that is, sideshow is a word with a more specific, narrower meaning than incident:

incident: a single distinct event
sideshow: a subordinate incident of little importance relative to the main event

Other hyponyms of incident include cause celebre, contagion, infection, transmission, scene.

incident (noun)	sideshow (noun)
a single distinct event	a minor show that is part of a larger one (as at the circus)
a public disturbance	a subordinate incident of little importance relative to the main event

incident (adjective)	sideshow (adjective)
(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence
falling or striking of light rays on something