Odds and Odds-on

Odds noun - A measure of how often an event will occur instead of another.

Odds-on and odds are semantically related. In some cases you can replace phrase "Odds-on" with "Odds", this terms are similar.

Odds-on adjective - Having a better than even chance of success.

Odds and odds-on are semantically related. Sometimes you can use "Odds" instead a noun phrase "Odds-on".