resistance has 9 distinct synonyms spread across 5 of its 11 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.
the action of opposing something that you disapprove or disagree with
“he encountered a general feeling of resistance from many citizens”
any mechanical force that tends to retard or oppose motion
a material's opposition to the flow of electric current; measured in ohms
the military action of resisting the enemy's advance
“the enemy offered little resistance”
the capacity of an organism to defend itself against harmful environmental agents
“these trees are widely planted because of their resistance to salt and smog”
a secret group organized to overthrow a government or occupation force
the degree of unresponsiveness of a disease-causing microorganism to antibiotics or other drugs (as in penicillin-resistant bacteria)
(psychiatry) an unwillingness to bring repressed feelings into conscious awareness
an electrical device that resists the flow of electrical current
group action in opposition to those in power
Synonyms, antonyms and the broader and narrower relations for resistance come from Princeton University’s WordNet. Full sources and licences.