stonewaller vs obstructionist

stonewaller and obstructionist both are nouns.

Word	Noun	Adjective	Verb	Adverb
stonewaller	Yes	No	No	No
obstructionist	Yes	No	No	No

As nouns, obstructionist is a hypernym of stonewaller; that is, obstructionist is a word with a broader meaning than stonewaller:

stonewaller: one who stonewalls or refuses to answer or cooperate; someone who delays by lengthy speeches etc.
obstructionist: someone who systematically obstructs some action that others want to take

Other hypernyms of stonewaller include obstructer, obstructor, resister, thwarter.

stonewaller (noun)	obstructionist (noun)
one who stonewalls or refuses to answer or cooperate; someone who delays by lengthy speeches etc.	someone who systematically obstructs some action that others want to take