blood extravasation vs bleeding

blood extravasation and bleeding both are nouns.

Word	Noun	Adjective	Verb	Adverb
blood extravasation	Yes	No	No	No
bleeding	Yes	No	No	No

As nouns, bleeding is a hypernym of blood extravasation; that is, bleeding is a word with a broader meaning than blood extravasation:

blood extravasation: the leakage of blood from a vessel into tissues surrounding it; can occur in injuries or burns or allergic reactions
bleeding: the flow of blood from a ruptured blood vessel

Other hypernyms of blood extravasation include extravasation, haemorrhage, hemorrhage.

blood extravasation (noun)	bleeding (noun)
the leakage of blood from a vessel into tissues surrounding it; can occur in injuries or burns or allergic reactions	the flow of blood from a ruptured blood vessel