Synonyms for Reciprocal:

adj.

all (adjective)
mutual.
correlational (adjective)
correlated, interlaced, interrelated, mutual, merged, co-active, Dovetailed, interconnected, meshed, intertwined, interactive, correlational, intermeshed, collaborative, cooperational, complementary, interwoven, back and forth, interdependent.
exchanged, alternate (adjective)
correlative, exchangeable, mutual, complementary, reciprocative, reciprocatory, interchangeable, interdependent.
related (adjective)
correlative.

n.

commemorative, exchangeable, maiden, hostile, face saving, desperate, two-sided, lamely, limp, study at mutual, lame, amateur, attempted. connect. mathematics (noun)
dividend, power, algorithm, Multiplicator, divisor, coefficient, formula, logarithm, subtrahend, quotient, arithmetic, minuend, multiplicand, increment, factor, cube, quadratics, exponent, algebra, calculus, integral, modulus, square root, denominator, antilogarithm, fraction, cube root, geometry, multiplier, multiple, trigonometry, index, differential calculus, radix, root, numerator.
reciprocal (noun)
mutual, retaliative, inverse, avenging, requited, interchangeable, retributive, retaliatory, correlative, interactional, vindicatory, reciprocating, interactive, reciprocative, complementary, retributory, reciprocatory.

Other synonyms:

interchangeable
interchangeable, exchangeable.
Other relevant words:
exchangeable, reciprocatory, interchangeable, vindicatory, reciprocating, retaliatory, avenging, reciprocative, interactional, inverse, retributory, retributive, retaliative, correlative, requited.