herniation vs hernia

herniation and hernia both are nouns.

Word	Noun	Adjective	Verb	Adverb
herniation	Yes	No	No	No
hernia	Yes	No	No	No

As nouns, herniation and hernia are synonyms defined as:

herniation and hernia: rupture in smooth muscle tissue through which a bodily structure protrudes

herniation (noun)	hernia (noun)
rupture in smooth muscle tissue through which a bodily structure protrudes	rupture in smooth muscle tissue through which a bodily structure protrudes