Synonyms and related words :
atavistic, changeable, commutable, commutative, convertible, equal, equalizing, equivalent, even, exchanged, give-and-take, interchangeable, interchanged, mutual, permutable, reactionary, recessive, recidivist, recidivous, reciprocal, reciprocating, reciprocative, regressive, retaliatory, retrograde, retrogressive, retrorse, retroverse, reversible, reversional, reversionary, revertible, revulsionary, standard, swapped, switched, traded, transposed