1. (noun) someone who systematically obstructs some action that others want to take

• obstructer
• obstructionist
• obstructor
• thwarter

2. (noun) someone who offers opposition

• adversary
• antagonist
• opponent
• opposer

1. (noun) someone who systematically obstructs some action that others want to take

• controversialist
• disputant
• eristic

2. (noun) someone who offers opposition

• individual
• mortal
• person
• somebody
• someone
• soul

1. (noun) someone who systematically obstructs some action that others want to take

• naysayer
• stonewaller

2. (noun) someone who offers opposition

• dueler
• duelist
• dueller
• duellist
• enemy
• foe
• foeman
• opposition
• luddite
• withstander

1. (noun) someone who offers opposition

• agonist

1. (noun) someone who systematically obstructs some action that others want to take

• baffle
• bilk
• cross
• foil
• frustrate
• queer
• scotch
• spoil
• thwart
• balk
• baulk
• jib
• resist
• block
• block
• blockade
• blockade
• embarrass
• embarrass
• hinder
• hinder
• obstruct
• obstruct
• stymie
• stymie
• stymy
• stymy
• obstructionism

2. (noun) someone who offers opposition

• antagonism
• antagonism
• antagonism
• enmity
• hostility
• antagonistic
• counter
• balk
• baulk
• jib
• resist
• contradict
• controvert
• oppose
• defend
• fight
• fight back
• fight down
• oppose
• opponent
• opposing
• oppose
• oppose
• oppose
• react