Resistance is derived from Resist. Resist is a synonym of Reject. Reject is the opposite of Choose. 
Defend is a synonym of Support. Support is the opposite of Let. Let is the opposite of Keep. 
Resistance --DerivedFrom--> Resist <--Synonym--> Reject <--Antonym--> Choose 
Defend <--Synonym--> Support <--Antonym--> Let <--Antonym--> Keep 