silver certificate vs bill

silver certificate and bill both are nouns.

Word	Noun	Adjective	Verb	Adverb
silver certificate	Yes	No	No	No
bill	Yes	No	Yes	No

As nouns, bill is a hypernym of silver certificate; that is, bill is a word with a broader meaning than silver certificate:

silver certificate: formerly a bank note issued by the United States Treasury and redeemable in silver
bill: a piece of paper money (especially one issued by a central bank)

Other hypernyms of silver certificate include bank bill, bank note, banker's bill, banknote, Federal Reserve note, government note, greenback, note.

silver certificate (noun)	bill (noun)
formerly a bank note issued by the United States Treasury and redeemable in silver	the entertainment offered at a public presentation
	horny projecting mouth of a bird
	a brim that projects to the front to shade the eyes
	a cutting tool with a sharp edge
	a sign posted in a public place as an advertisement
	an itemized statement of money owed for goods shipped or services rendered
	an advertisement (usually printed on a page or in a leaflet) intended for wide distribution
	a statute in draft before it becomes law
	a list of particulars (as a playbill or bill of fare)
	a piece of paper money (especially one issued by a central bank)

silver certificate (verb)	bill (verb)
	advertise especially by posters or placards
	publicize or announce by placards
	demand payment