Surprise attack and Terrorist attack

Surprise attack noun - An attack without warning.

Terrorist attack and surprise attack are semantically related. In some cases you can replace phrase "Terrorist attack" with "Surprise attack", this phrases are similar.

Terrorist attack noun - A surprise attack involving the deliberate use of violence against civilians in the hope of attaining political or religious aims.

Surprise attack and terrorist attack are semantically related. You can use "Surprise attack" instead a noun phrase "Terrorist attack".