innards vs insides

innards and insides both are nouns.

Word	Noun	Adjective	Verb	Adverb
innards	Yes	No	No	No
insides	Yes	No	No	No

As nouns, innards and insides are synonyms defined as:

innards and insides: internal organs collectively (especially those in the abdominal cavity)

Other synonyms of innards include entrails, viscera.

innards (noun)	insides (noun)
internal organs collectively (especially those in the abdominal cavity)	internal organs collectively (especially those in the abdominal cavity)