entrails vs viscera

entrails and viscera both are nouns.

Word	Noun	Adjective	Verb	Adverb
entrails	Yes	No	No	No
viscera	Yes	No	No	No

As nouns, entrails and viscera are synonyms defined as:

entrails and viscera: internal organs collectively (especially those in the abdominal cavity)

Other synonyms of entrails include innards, insides.

entrails (noun)	viscera (noun)
internal organs collectively (especially those in the abdominal cavity)	internal organs collectively (especially those in the abdominal cavity)