IPO vs commerce

IPO and commerce both are nouns.

Word	Noun	Adjective	Verb	Adverb
IPO	Yes	No	No	No
commerce	Yes	No	No	No

As nouns, commerce is a hypernym of IPO; that is, commerce is a word with a broader meaning than IPO:

IPO: a corporation's first offer to sell stock to the public
commerce: transactions (sales and purchases) having the objective of supplying commodities (goods and services)

Other hypernyms of IPO include commercialism, mercantilism.

IPO (noun)	commerce (noun)
a corporation's first offer to sell stock to the public	transactions (sales and purchases) having the objective of supplying commodities (goods and services)
	social exchange, especially of opinions, attitudes, etc.