crony vs sidekick

crony and sidekick both are nouns.

Word	Noun	Adjective	Verb	Adverb
crony	Yes	No	No	No
sidekick	Yes	No	No	No

As nouns, crony and sidekick are synonyms defined as:

crony and sidekick: a close friend who accompanies his buddies in their activities

Other synonyms of crony include brother, buddy, chum, pal.

crony (noun)	sidekick (noun)
a close friend who accompanies his buddies in their activities	a close friend who accompanies his buddies in their activities