price war vs competition

price war and competition both are nouns.

Word	Noun	Adjective	Verb	Adverb
price war	Yes	No	No	No
competition	Yes	No	No	No

As nouns, competition is a hypernym of price war; that is, competition is a word with a broader meaning than price war:

price war: intense competition in which competitors cut retail prices to gain business
competition: a business relation in which two parties compete to gain customers

price war (noun)	competition (noun)
intense competition in which competitors cut retail prices to gain business	the act of competing as for profit or a prize
	an occasion on which a winner is selected from among two or more contestants
	the contestant you hope to defeat
	a business relation in which two parties compete to gain customers