angioma vs hemangioma

angioma and hemangioma both are nouns.

Word	Noun	Adjective	Verb	Adverb
angioma	Yes	No	No	No
hemangioma	Yes	No	No	No

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

angioma: a tumor consisting of a mass of blood or lymphatic vessels
hemangioma: benign angioma consisting of a mass of blood vessels; some appear as birthmarks

Other hyponyms of angioma include haemangioma, lymphangioma, spider angioma, spider nevus, vascular spider.

angioma (noun)	hemangioma (noun)
a tumor consisting of a mass of blood or lymphatic vessels	benign angioma consisting of a mass of blood vessels; some appear as birthmarks