girdle vs panty girdle

girdle and panty girdle both are nouns.

Word	Noun	Adjective	Verb	Adverb
girdle	Yes	No	Yes	No
panty girdle	Yes	No	No	No

As nouns, panty girdle is a hyponym of girdle; that is, panty girdle is a word with a more specific, narrower meaning than girdle:

girdle (noun)	panty girdle (noun)
a woman's close-fitting foundation garment	a woman's undergarment that combines a girdle and panties
a band of material around the waist that strengthens a skirt or trousers
an encircling or ringlike structure

girdle (verb)	panty girdle (verb)
put a girdle on or around
cut a girdle around so as to kill by interrupting the circulation of water and nutrients