peritonitis vs inflammation

peritonitis and inflammation both are nouns.

Word	Noun	Adjective	Verb	Adverb
peritonitis	Yes	No	No	No
inflammation	Yes	No	No	No

As nouns, inflammation is a hypernym of peritonitis; that is, inflammation is a word with a broader meaning than peritonitis:

peritonitis: inflammation of the peritoneum
inflammation: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of peritonitis include redness, rubor.

peritonitis (noun)	inflammation (noun)
inflammation of the peritoneum	arousal to violent emotion
	the act of setting something on fire
	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat
	the state of being emotionally aroused and worked up