pilar cyst vs cyst

pilar cyst and cyst both are nouns.

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

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

pilar cyst: a common cyst of the skin; filled with fatty matter (sebum) that is secreted by a sebaceous gland that has been blocked
cyst: a closed sac that develops abnormally in some body structure

pilar cyst (noun)	cyst (noun)
a common cyst of the skin; filled with fatty matter (sebum) that is secreted by a sebaceous gland that has been blocked	a small anatomically normal sac or bladderlike structure (especially one containing fluid)
	a closed sac that develops abnormally in some body structure