transfusion vs intromission

transfusion and intromission both are nouns.

Word	Noun	Adjective	Verb	Adverb
transfusion	Yes	No	No	No
intromission	Yes	No	No	No

As nouns, intromission is a hypernym of transfusion; that is, intromission is a word with a broader meaning than transfusion:

transfusion: the introduction of blood or blood plasma into a vein or artery
intromission: the act of putting one thing into another

Other hypernyms of transfusion include insertion, introduction.

transfusion (noun)	intromission (noun)
the introduction of blood or blood plasma into a vein or artery	the act of putting one thing into another
the action of pouring a liquid from one vessel to another