saleslady vs adult female

saleslady and adult female both are nouns.

Word	Noun	Adjective	Verb	Adverb
saleslady	Yes	No	No	No
adult female	Yes	No	No	No

As nouns, adult female is a hypernym of saleslady; that is, adult female is a word with a broader meaning than saleslady:

Other hypernyms of saleslady include sales rep, sales representative, salesperson, woman.

saleslady (noun)	adult female (noun)
a woman salesperson	an adult female person (as opposed to a man)