buck vs Federal Reserve note

buck and Federal Reserve note both are nouns.

Word	Noun	Adjective	Verb	Adverb
buck	Yes	No	Yes	No
Federal Reserve note	Yes	No	No	No

As nouns, Federal Reserve note is a hypernym of buck; that is, Federal Reserve note is a word with a broader meaning than buck:

buck: a piece of paper money worth one dollar
Federal Reserve note: a piece of paper money (especially one issued by a central bank)

Other hypernyms of buck include bank bill, bank note, banker's bill, banknote, bill, government note, greenback, note.

buck (noun)	Federal Reserve note (noun)
mature male of various mammals (especially deer or antelope)	a piece of paper money (especially one issued by a central bank)
a framework for holding wood that is being sawed
a gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting
a piece of paper money worth one dollar

buck (verb)	Federal Reserve note (verb)
jump vertically, with legs stiff and back arched
move quickly and violently
resist
to strive with determination