reciprocally vs in return

reciprocally and in return both are adverbs.

Word	Noun	Adjective	Verb	Adverb
reciprocally	No	No	No	Yes
in return	No	No	No	Yes

As adverbs, reciprocally and in return are synonyms defined as:

reciprocally and in return: (often followed by `for') in exchange or in reciprocation

reciprocally (adverb)	in return (adverb)
in an inverse or contrary manner	(often followed by `for') in exchange or in reciprocation
in a mutual or shared manner
(often followed by `for') in exchange or in reciprocation