He tends to make rivals in business.
noun
Refers to a hostile force, danger, or something that harms. Often used in abstract or figurative contexts, such as 敵は本能寺にあり (the real enemy is elsewhere).
彼は国民の敵とみなされた。
He was regarded as an enemy of the people.
油断は最大の敵だ。
Carelessness is your worst enemy.
味方 means 'ally' or 'friend' and is the direct antonym of 敵 in the opponent sense.
The kanji 敵 originally meant 'enemy' or 'opponent' in Chinese. The Japanese reading てき is the on'yomi. The word has been used since Old Japanese to refer to adversaries and threats.