mastitis vs inflammation

mastitis and inflammation both are nouns.

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

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

mastitis: inflammation of a breast (or udder)
inflammation: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of mastitis include redness, rubor.

mastitis (noun)	inflammation (noun)
inflammation of a breast (or udder)	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