selling vs commercialism

selling and commercialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
selling	Yes	No	No	No
commercialism	Yes	No	No	No

As nouns, commercialism is a hypernym of selling; that is, commercialism is a word with a broader meaning than selling:

selling: the exchange of goods for an agreed sum of money
commercialism: transactions (sales and purchases) having the objective of supplying commodities (goods and services)

Other hypernyms of selling include commerce, mercantilism.

selling (noun)	commercialism (noun)
the exchange of goods for an agreed sum of money	transactions (sales and purchases) having the objective of supplying commodities (goods and services)