chancroid vs ulcer

chancroid and ulcer both are nouns.

Word	Noun	Adjective	Verb	Adverb
chancroid	Yes	No	No	No
ulcer	Yes	No	No	No

As nouns, ulcer is a hypernym of chancroid; that is, ulcer is a word with a broader meaning than chancroid:

chancroid: infectious venereal ulcer
ulcer: a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue

Other hypernyms of chancroid include ulceration.

chancroid (noun)	ulcer (noun)
infectious venereal ulcer	a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue