sight bill vs bill of exchange

sight bill and bill of exchange both are nouns.

Word	Noun	Adjective	Verb	Adverb
sight bill	Yes	No	No	No
bill of exchange	Yes	No	No	No

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

sight bill: a draft payable on presentation
bill of exchange: a document ordering the payment of money; drawn by one person or bank on another

Other hypernyms of sight bill include draft, order of payment.

sight bill (noun)	bill of exchange (noun)
a draft payable on presentation	a document ordering the payment of money; drawn by one person or bank on another