lollipop lady vs adult female

lollipop lady and adult female both are nouns.

Word	Noun	Adjective	Verb	Adverb
lollipop lady	Yes	No	No	No
adult female	Yes	No	No	No

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

lollipop lady: a woman hired to help children cross a road safely near a school
adult female: an adult female person (as opposed to a man)

Other hypernyms of lollipop lady include crossing guard, woman.

lollipop lady (noun)	adult female (noun)
a woman hired to help children cross a road safely near a school	an adult female person (as opposed to a man)