pressure cooker vs steriliser

pressure cooker and steriliser both are nouns.

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

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

pressure cooker: autoclave for cooking at temperatures above the boiling point of water
steriliser: 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, sterilizer.

pressure cooker (noun)	steriliser (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