reciprocative vs reciprocal

reciprocative is not a noun while reciprocal is a noun.

Word	Noun	Adjective	Verb	Adverb
reciprocative	No	Yes	No	No
reciprocal	Yes	Yes	No	No

reciprocative (noun)	reciprocal (noun)
	hybridization involving a pair of crosses that reverse the sexes associated with each genotype
	(mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2; the multiplicative inverse of 7 is 1/7
	something (a term or expression or concept) that has an inverse relation to something else

reciprocative (adjective)	reciprocal (adjective)
moving alternately backward and forward	concerning each of two or more persons or things; especially given or done in return
given or done or owed to each other	of or relating to the multiplicative inverse of a quantity or function