enemy vs competition

enemy and competition both are nouns.

Word	Noun	Adjective	Verb	Adverb
enemy	Yes	No	No	No
competition	Yes	No	No	No

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

Other hypernyms of enemy include challenger, competitor, contender, rival.

enemy (noun)	competition (noun)
an opposing military force	the act of competing as for profit or a prize
any hostile group of people	an occasion on which a winner is selected from among two or more contestants
an armed adversary (especially a member of an opposing military force)	the contestant you hope to defeat
a personal enemy	a business relation in which two parties compete to gain customers