WordNet: obstructer, obstructionist, obstructor, resister, thwarter

someone who systematically obstructs some action that others want to take

• hypernym controversialist, disputant, eristic

• hyponym naysayer

• hyponym stonewaller

obstructer

• (englanti) obstruct (derivationally related)
• (suomi) hidastaja (synonyymi)

obstructionist

• (englanti) obstructionism (derivationally related)
• (suomi) jarruttaja (synonyymi)

obstructor

• (englanti) obstruct (derivationally related)
• (suomi) jarruttaja (synonyymi)

resister

• (englanti) resist (derivationally related)
• (suomi) vastustaja (synonyymi)

thwarter

• (englanti) thwart (derivationally related)
• (suomi) estelijä (synonyymi)