digester vs sterilizer

digester and sterilizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
digester	Yes	No	No	No
sterilizer	Yes	No	No	No

As nouns, sterilizer is a hypernym of digester; that is, sterilizer is a word with a broader meaning than digester:

digester: autoclave consisting of a vessel in which plant or animal materials are digested
sterilizer: a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments

Other hypernyms of digester include autoclave, steriliser.

digester (noun)	sterilizer (noun)
autoclave consisting of a vessel in which plant or animal materials are digested	a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments