negativist vs balker

negativist and balker both are nouns.

Word	Noun	Adjective	Verb	Adverb
negativist	Yes	No	No	No
balker	Yes	No	No	No

As nouns, balker is a hypernym of negativist; that is, balker is a word with a broader meaning than negativist:

negativist: someone who refuses to do what is asked or does the opposite of what is asked
balker: a person who refuses to comply

Other hypernyms of negativist include baulker, noncompliant.

negativist (noun)	balker (noun)
someone who is resigned to defeat without offering positive suggestions	a person who refuses to comply
someone who refuses to do what is asked or does the opposite of what is asked