returnable (adj.)
- atavistic
- changeable
- commutable
- commutative
- convertible
- equal
- equivalent
- even
- exchanged
- interchangeable
- mutual
- permutable
- reactionary
- recessive
- reciprocal
- reciprocating
- reciprocative
- regressive
- retaliatory
- retrograde
- retrogressive
- retrorse
- reversible
- reversionary
- revertible
- standard
- transposed
