money vs sterling

money and sterling both are nouns.

Word	Noun	Adjective	Verb	Adverb
money	Yes	No	No	No
sterling	Yes	Yes	No	No

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

money: the official currency issued by a government or national bank
sterling: British money; especially the pound sterling as the basic monetary unit of the UK

money (noun)	sterling (noun)
the most common medium of exchange; functions as legal tender	British money; especially the pound sterling as the basic monetary unit of the UK
the official currency issued by a government or national bank
wealth reckoned in terms of money

money (adjective)	sterling (adjective)
	highest in quality