sterilizer vs vessel

sterilizer and vessel both are nouns.

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

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

sterilizer: a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments
vessel: an object used as a container (especially for liquids)

sterilizer (noun)	vessel (noun)
a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments	a craft designed for water transportation
	an object used as a container (especially for liquids)
	a tube in which a body fluid circulates