Definitions of rival:

• noun:   the contestant you hope to defeat

  Example: "He had respect for his rivals"

• verb:   be the rival of, be in competition with

  Example: "We are rivaling for first place in the race"

• verb:   be equal to in quality or ability

  Example: "Nothing can rival cotton for durability"

• name:  A surname (very rare: popularity rank in the U.S.: #54633)