wen vs chalazion

wen and chalazion both are nouns.

Word	Noun	Adjective	Verb	Adverb
wen	Yes	No	No	No
chalazion	Yes	No	No	No

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

wen: a common cyst of the skin; filled with fatty matter (sebum) that is secreted by a sebaceous gland that has been blocked
chalazion: a small sebaceous cyst of the eyelid resulting when a Meibomian gland is blocked

Other hyponyms of wen include Meibomian cyst.

wen (noun)	chalazion (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 sebaceous cyst of the eyelid resulting when a Meibomian gland is blocked