Origin: Greek suffix -ist
Antagonist has 4 different meanings across 1 category:
someone who offers opposition
"The detective's main antagonist was not a shadowy villain, but his own partner who constantly questioned every lead and blocked their progress."
a muscle that relaxes while another contracts
"when bending the elbow the triceps are the antagonist"
a drug that neutralizes or counteracts the effects of another drug
"The doctor warned that mixing two different painkillers could create an antagonist effect, leaving him in even more discomfort than before."
An opponent or enemy.
"The villain served as the main antagonist, constantly trying to stop the hero from saving the city."