crinoline vs underskirt

crinoline and underskirt both are nouns.

Word	Noun	Adjective	Verb	Adverb
crinoline	Yes	No	No	No
underskirt	Yes	No	No	No

As nouns, underskirt is a hypernym of crinoline; that is, underskirt is a word with a broader meaning than crinoline:

Other hypernyms of crinoline include half-slip, petticoat.

crinoline (noun)	underskirt (noun)
a stiff coarse fabric used to stiffen hats or clothing	undergarment worn under a skirt
a full stiff petticoat made of crinoline fabric
a skirt stiffened with hoops