rival-n; 2 Senses

Sense Number 1: competitor, challenger

Commentary: RIVAL[+entity][+person][+competitor]
NOTE: refers to competitors actively challenging each other.

John considers Bob a rival for the job promotion at work.
There were frequent gun battles between the rival gangs.
The beautiful princess had many rivals seeking her hand in marriage.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: an equal, a peer

Commentary: RIVAL[+relation][+role][+equality][+peer]
NOTE: refers to someone/something being an equal or peer to another
NOTE: often occurs in the negative - 'X has no rival'

In the opera world today the young Italian coloratura soprano has no rivals.
In recent years certain Australian red wines have become genuine rivals to some of the better French labels.
Has there ever been a rival to Jimmy Hendrix as a guitar player?

WordNet 0.0 Sense Numbers: 1b