cat burglar vs burglar

cat burglar and burglar both are nouns.

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

As nouns, burglar is a hypernym of cat burglar; that is, burglar is a word with a broader meaning than cat burglar:

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

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