fiver vs nickel

fiver and nickel both are nouns.

Word	Noun	Adjective	Verb	Adverb
fiver	Yes	No	No	No
nickel	Yes	No	Yes	No

As nouns, nickel is a hyponym of fiver; that is, nickel is a word with a more specific, narrower meaning than fiver:

Other hyponyms of fiver include nickel note.

fiver (noun)	nickel (noun)
a United States bill worth 5 dollars	a United States coin worth one twentieth of a dollar
	five dollars worth of a drug
	a hard malleable ductile silvery metallic element that is resistant to corrosion; used in alloys; occurs in pentlandite and smaltite and garnierite and millerite

fiver (verb)	nickel (verb)
	plate with nickel