counteractor
Agent against something
A counteractor is a person or thing that counteracts—that opposes, neutralizes, or works against something else.
The word appears occasionally in technical or formal contexts: The drug acts as a counteractor to the poison.
More often, English speakers simply use "counteragent" or rephrase with the verb "counteract."
Something that obstructs
- suppressantAgent that restrains activity
- inhibitorAgent that slows reactions
- repressorAgent blocking transcription
- antagonistOne who opposes another
dampener · moderator · regulator · check · restraint · silencer · quencher · retardant
Substance neutralizing harmful agents
- antivenomSerum countering toxic bites
- remedyCurative treatment or fix
- detoxifierAgent removing harmful substances
- deactivatorThing that turns off
decontaminant · counteragent · antitoxin · cure · corrective · countermeasure · nullifier · negator
Enemy in conflict
- opposerOne who resists
- antagonistOne who opposes another
- resisterOne who opposes
- obstructorOne who blocks progress
challenger · combatant · disputant · dissenter · objector · contrarian · detractor · underminer
Underlying supporting material
- cofactorEnzyme-activating compound
- coenzymeEnzyme's nonprotein helper molecule
- phosphatasePhosphate-cleaving enzyme
blocker
Something that obstructs
- suppressantAgent that restrains activity
- inhibitorAgent that slows reactions
- repressorAgent blocking transcription
antagonist · dampener · moderator · regulator · check · restraint · silencer · quencher · retardant · attenuator
antidote
Substance neutralizing harmful agents
- antivenomSerum countering toxic bites
- remedyCurative treatment or fix
- detoxifierAgent removing harmful substances
deactivator · decontaminant · counteragent · antitoxin · cure · corrective · countermeasure · nullifier · negator · counterbalance
adversary
Enemy in conflict
- opposerOne who resists
- antagonistOne who opposes another
- resisterOne who opposes
obstructor · challenger · combatant · disputant · dissenter · objector · contrarian · detractor · underminer · foil
substrate
Underlying supporting material
- cofactorEnzyme-activating compound
- coenzymeEnzyme's nonprotein helper molecule
- phosphatasePhosphate-cleaving enzyme
counteractoramplifier
Signal-strengthening electronic device
enhancer · intensifier · booster · magnifier · strengthener
counteractorsupporter
One who backs another
ally · collaborator · facilitator · enabler · promoter
counteract, counteracts, counteracted, counteracting, counteraction, counteractive