brasier vs heater

brasier and heater both are nouns.

Word	Noun	Adjective	Verb	Adverb
brasier	Yes	No	No	No
heater	Yes	No	No	No

As nouns, heater is a hypernym of brasier; that is, heater is a word with a broader meaning than brasier:

brasier: large metal container in which coal or charcoal is burned; warms people who must stay outside for long times
heater: device that heats water or supplies warmth to a room

Other hypernyms of brasier include warmer.

brasier (noun)	heater (noun)
large metal container in which coal or charcoal is burned; warms people who must stay outside for long times	(baseball) a pitch thrown with maximum velocity
	device that heats water or supplies warmth to a room