dermoid cyst vs cyst

dermoid cyst and cyst both are nouns.

Word	Noun	Adjective	Verb	Adverb
dermoid cyst	Yes	No	No	No
cyst	Yes	No	No	No

As nouns, cyst is a hypernym of dermoid cyst; that is, cyst is a word with a broader meaning than dermoid cyst:

dermoid cyst: a cystic tumor (usually benign) with a wall lined with epithelium and a cavity containing other material
cyst: a closed sac that develops abnormally in some body structure

dermoid cyst (noun)	cyst (noun)
a cystic tumor (usually benign) with a wall lined with epithelium and a cavity containing other material	a small anatomically normal sac or bladderlike structure (especially one containing fluid)
	a closed sac that develops abnormally in some body structure