thrombus vs coagulum

thrombus and coagulum both are nouns.

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

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

thrombus: a blood clot formed within a blood vessel and remaining attached to its place of origin
coagulum: a lump of material formed from the content of a liquid

Other hypernyms of thrombus include clot.

thrombus (noun)	coagulum (noun)
a blood clot formed within a blood vessel and remaining attached to its place of origin	a lump of material formed from the content of a liquid