noma vs ulcer

noma and ulcer both are nouns.

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

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

noma: acute ulceration of the mucous membranes of the mouth or genitals; often seen in undernourished children
ulcer: a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue

Other hypernyms of noma include ulceration.

noma (noun)	ulcer (noun)
acute ulceration of the mucous membranes of the mouth or genitals; often seen in undernourished children	a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue