IPA: //nɒn.kəmˈpɛt.ɪ.tər//
KK: /nɑnˈkɒmpɪˌtɚ/
A person or entity that does not compete in a particular field or activity.
In the race, she was a noncompetitor, choosing to support her friends instead of competing.
Noncompetitor → It is formed from "non-" (meaning not) and "competitor" (from Latin "competere", meaning to strive together). The word "noncompetitor" refers to someone who does not strive or compete in a particular context.
Think of 'not' ('non-') being added to someone who 'strives together' ('competitor') — that's why a noncompetitor is someone who does not compete.