burglar vs housebreaker

burglar and housebreaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
burglar	Yes	No	No	No
housebreaker	Yes	No	No	No

As nouns, housebreaker is a hyponym of burglar; that is, housebreaker is a word with a more specific, narrower meaning than burglar:

burglar: a thief who enters a building with intent to steal
housebreaker: a burglar who unlawfully breaks into and enters another person's house

Other hyponyms of burglar include cat burglar.

burglar (noun)	housebreaker (noun)
a thief who enters a building with intent to steal	a burglar who unlawfully breaks into and enters another person's house
	a wrecker of houses