Eurodollar vs Eurocurrency

Eurodollar and Eurocurrency both are nouns.

Word	Noun	Adjective	Verb	Adverb
Eurodollar	Yes	No	No	No
Eurocurrency	Yes	No	No	No

As nouns, Eurocurrency is a hypernym of Eurodollar; that is, Eurocurrency is a word with a broader meaning than Eurodollar:

Eurodollar: a United States dollar deposited in a European bank and used as an international currency to finance trade
Eurocurrency: currency of the major financial and industrial countries held in those countries for the purpose of lending and borrowing

Other hypernyms of Eurodollar include United States dollar.

Eurodollar (noun)	Eurocurrency (noun)
a United States dollar deposited in a European bank and used as an international currency to finance trade	currency of the major financial and industrial countries held in those countries for the purpose of lending and borrowing