marketing vs retailing

marketing and retailing both are nouns.

Word	Noun	Adjective	Verb	Adverb
marketing	Yes	No	No	No
retailing	Yes	No	No	No

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

marketing: the exchange of goods for an agreed sum of money
retailing: the activities involved in selling commodities directly to consumers

marketing (noun)	retailing (noun)
the exchange of goods for an agreed sum of money	the activities involved in selling commodities directly to consumers
shopping at a market
the commercial processes involved in promoting and selling and distributing a product or service