embolus vs coagulum

embolus and coagulum both are nouns.

Word	Noun	Adjective	Verb	Adverb
embolus	Yes	No	No	No
coagulum	Yes	No	No	No

As nouns, coagulum is a hypernym of embolus; that is, coagulum is a word with a broader meaning than embolus:

embolus: an abnormal particle (e.g. an air bubble or part of a clot) circulating in the blood
coagulum: a lump of material formed from the content of a liquid

Other hypernyms of embolus include clot.

embolus (noun)	coagulum (noun)
an abnormal particle (e.g. an air bubble or part of a clot) circulating in the blood	a lump of material formed from the content of a liquid