step-in vs pantie

step-in and pantie both are nouns.

Word	Noun	Adjective	Verb	Adverb
step-in	Yes	No	No	No
pantie	Yes	No	No	No

As nouns, step-in and pantie are synonyms defined as:

Other synonyms of step-in include panty, scanty.

step-in (noun)	pantie (noun)
short underpants for women or children	short underpants for women or children