Game concept
Contractor
The game also links it as Contractors, Contractor's, Contractors'.
From the game's encyclopedia
A Contractor is the Character putting out a Contract.
The Contract will generally chiefly affect them, and they are usually the one paying an Adventurer's wages.
Criminal Contracts are generally not put out by their Contractor, and instead focus on exploiting them — for instance, tricking someone into giving you Gold because they signaled their gullability.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Contractor is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Contractor is the Character putting out a Contract." It is part of Contract. The game also links it as Contractors, Contractor's and Contractors'. Patch 1.20.1.2, from game/common/game_concepts/07_ep3_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/07_ep3_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.