Antonyms for the term "fellow-worker" include words that indicate opposite meanings such as antagonist, adversary, enemy, opponent, and rival. These words convey a negative connotation, suggesting that the opposite of a "fellow worker" is someone who is in opposition rather than in collaboration. In contrast, other antonyms for "fellow-worker" might suggest a lack of relationship or even isolation, such as hermit, loner, recluse, or solitary. Still, other antonyms for "fellow-worker" might evoke a more formulaic or hierarchical model of work, such as boss or supervisor. Whatever the antonym, it is clear that the term "fellow-worker" suggests a certain camaraderie and respect, lacking in many of its opposites.