settler vs negotiator

settler and negotiator both are nouns.

Word	Noun	Adjective	Verb	Adverb
settler	Yes	No	No	No
negotiator	Yes	No	No	No

As nouns, negotiator is a hypernym of settler; that is, negotiator is a word with a broader meaning than settler:

settler: a negotiator who settles disputes
negotiator: someone who negotiates (confers with others in order to reach a settlement)

Other hypernyms of settler include negotiant, treater.

settler (noun)	negotiator (noun)
a person who settles in a new colony or moves into new country	someone who negotiates (confers with others in order to reach a settlement)
a clerk in a betting shop who calculates the winnings
a negotiator who settles disputes