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Synonyms for Resistance (same or very similar meaning)

WordNet sense 1 ((medicine) the condition in which an organism can resist disease):
immunity

WordNet sense 2 (a material's opposition to the flow of electric current; measured in ohms):
impedance, resistivity, electric resistance, electrical resistance, ohmic resistance

WordNet sense 3 (a secret group organized to overthrow a government or occupation force):
underground

WordNet sense 4 (an electrical device that resists the flow of electrical current):
resistor

WordNet sense 5 (the action of opposing something that you disapprove or disagree with):
opposition


From the ODE community, based on WordNetadd/edit