holdout vs treater

holdout and treater both are nouns.

Word	Noun	Adjective	Verb	Adverb
holdout	Yes	No	No	No
treater	Yes	No	No	No

As nouns, treater is a hypernym of holdout; that is, treater is a word with a broader meaning than holdout:

holdout: a negotiator who hopes to gain concessions by refusing to come to terms
treater: someone who negotiates (confers with others in order to reach a settlement)

Other hypernyms of holdout include negotiant, negotiator.

holdout (noun)	treater (noun)
the act of hiding playing cards in a gambling game so they are available for personal use later	someone who negotiates (confers with others in order to reach a settlement)
a refusal by a negotiator to come to terms in the hope of obtaining a better deal
a negotiator who hopes to gain concessions by refusing to come to terms