Omen and Tipoff

Omen noun - Something believed to be a sign or warning of a future event.

Tipoff and omen are semantically related In some cases you can replace term "Tipoff" with "Omen", this nouns are similar.

Omen and tipoff are semantically related in indication topic. Sometimes you can use "Omen" instead a noun "Tipoff", if it concerns topics such as warning, notice of possible occurrence.