ulcer vs noma

ulcer and noma both are nouns.

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

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

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

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