RECIPROCATE, RETALIATE, REQUITE, RETURN mean to give back usually in kind or in quantity.

RECIPROCATE implies a mutual or equivalent exchange or a paying back of what one has received.

e.g. reciprocated their hospitality by inviting them for a visit

RETALIATE usually implies a paying back of injury in exact kind, often vengefully.

e.g. the enemy retaliated by executing their prisoners

REQUITE implies a paying back according to one's preference and often not equivalently.

e.g. requited her love with cold indifference

RETURN implies a paying or giving back.

e.g. returned their call return good for evil

verb with object formal

make appropriate return for (a favor, service, or wrongdoing):

｟かたく｠ «…で» …に報いる, 返礼をする; …に報復する «with»

e.g. they are quick to requite a kindness.

return a favor to (someone):

e.g. to win enough to requite my friends.

respond to (love or affection); return:

e.g. she did not requite his love.

requital |rəˈkwīdl| noun

early 16th century: from re- ‘back’ + obsolete quite, variant of the verb quit1.