pressure cooker vs sterilizer

pressure cooker and sterilizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
pressure cooker	Yes	No	No	No
sterilizer	Yes	No	No	No

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

pressure cooker: autoclave for cooking at temperatures above the boiling point of water
sterilizer: a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments

Other hypernyms of pressure cooker include autoclave, steriliser.

pressure cooker (noun)	sterilizer (noun)
autoclave for cooking at temperatures above the boiling point of water	a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments