salesgirl vs woman

salesgirl and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
salesgirl	Yes	No	No	No
woman	Yes	No	No	No

As nouns, woman is a hypernym of salesgirl; that is, woman is a word with a broader meaning than salesgirl:

Other hypernyms of salesgirl include sales rep, sales representative, salesperson, adult female.

salesgirl (noun)	woman (noun)
a woman salesperson	women as a class
	an adult female person (as opposed to a man)
	a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man