enemy vs competitor

enemy and competitor both are nouns.

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

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

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

enemy (noun)	competitor (noun)
an opposing military force	the contestant you hope to defeat
any hostile group of people
an armed adversary (especially a member of an opposing military force)
a personal enemy