working girl vs hustler

working girl and hustler both are nouns.

Word	Noun	Adjective	Verb	Adverb
working girl	Yes	No	No	No
hustler	Yes	No	No	No

As nouns, hustler is a hyponym of working girl; that is, hustler is a word with a more specific, narrower meaning than working girl:

working girl (noun)	hustler (noun)
a young woman who is employed	a shrewd or unscrupulous person who knows how to circumvent difficulties
a woman who engages in sexual intercourse for money	a prostitute who attracts customers by walking the streets