girdle vs cummerbund

girdle and cummerbund both are nouns.

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

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

girdle: a band of material around the waist that strengthens a skirt or trousers
cummerbund: a broad pleated sash worn as formal dress with a tuxedo

girdle (noun)	cummerbund (noun)
a woman's close-fitting foundation garment	a broad pleated sash worn as formal dress with a tuxedo
a band of material around the waist that strengthens a skirt or trousers
an encircling or ringlike structure

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