boiler vs kettle

boiler and kettle both are nouns.

Word	Noun	Adjective	Verb	Adverb
boiler	Yes	No	No	No
kettle	Yes	No	No	No

As nouns, boiler and kettle are synonyms defined as:

boiler and kettle: a metal pot for stewing or boiling; usually has a lid

boiler (noun)	kettle (noun)
sealed vessel where water is converted to steam	a metal pot for stewing or boiling; usually has a lid
a metal pot for stewing or boiling; usually has a lid	a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it
	(geology) a hollow (typically filled by a lake) that results from the melting of a mass of ice trapped in glacial deposits
	the quantity a kettle will hold