Pursuit (noun) تعاقب، تلاش

the action of pursuing someone or something.
Example: “the cat crouched in the grass in pursuit of a bird”
Synonyms: chasing, pursuing, stalking, tracking, trailing, shadowing, dogging, hounding, chase after
Antonyms: retreat, surrender
Vendetta (noun) قبائلی جھگڑا، خاندانی دشمنی

a prolonged bitter quarrel with or campaign against someone.
Example: “he has accused the British media of pursuing a vendetta against him”
Synonyms: feud, blood feud, quarrel, argument, falling-out, wrangle, clash, altercation, dispute
Antonyms: agreement, forgiveness, calm, harmony