lollipop lady vs lollipop woman

lollipop lady and lollipop woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
lollipop lady	Yes	No	No	No
lollipop woman	Yes	No	No	No

As nouns, lollipop lady and lollipop woman are synonyms defined as:

lollipop lady and lollipop woman: a woman hired to help children cross a road safely near a school

lollipop lady (noun)	lollipop woman (noun)
a woman hired to help children cross a road safely near a school	a woman hired to help children cross a road safely near a school