Turf Wars are a mechanic introduced into Monster Hunter World. When two monsters meet, they might engage in a cinematic battle where either one or both monsters take significant damage and drop an item.
List of Monster Turf Wars
Monster Hunter World: Iceborne
For more information, see MHWI: Turf War List
Monster Hunter Rise
For more information, see MHRise: Turf War List
Bond Attacks are a mechanic introduced into Monster Hunter World with the introduction of Lunastra as a DLC. They are a special attack that has two monsters fuse their attacks together to create a massive, highly damaging attack. So far the only monsters that can do this are Teostra and Lunastra.
List of Monster Bond Attacks
Ambush is a special action performed by Crimson Glow Valstrax in Monster Hunter Rise. When perform against a monster, the targeted monster will cease any action, run toward the center of the area and looking around, after which Valstrax will plummet from the sky, knocking down the target monster and hunters close by, but deals no damage to hunters. This action is also used against the hunter, in which the hunters are fully affected by the Ambush. When Valstrax performs this action, a prompt similar to normal Turf War prompt appears on screen, notifying the action.