settlement has 8 distinct synonyms spread across 5 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a body of people who settle far from home but maintain ties with their homeland; inhabitants remain nationals of their home state but are not literally under the home state's system of government
“the American colony in Paris”
a community of people smaller than a town
a conclusive resolution of a matter and disposition of it
the act of colonizing; the establishment of colonies
“the British colonization of America”
something settled or resolved; the outcome of decision making
“they finally reached a settlement with the union”
an area where a group of families live together
termination of a business operation by using its assets to discharge its liabilities
Synonyms, antonyms and the broader and narrower relations for settlement come from Princeton University’s WordNet. Full sources and licences.