* Favor (to show preference): This could be translated with words like προτίμηση (protimēsi - preference), ευνοία (eunoia - goodwill, favor), or μεροληψία (merolipsia - partiality, bias), depending on the nuance.
* Favor (a kind act): This could be translated with words like χάρη (chari - favor, grace, kindness), ευγένεια (eugéneia - kindness, courtesy), or υπηρεσία (ypiresia - service).
* Favor (a token of affection): This might use δώρο (dōro - gift) or ενθύμιο (enthymio - keepsake, souvenir).
* Favor (to resemble): This would use something like μοιάζω (moiázō - to resemble) or παρόμοιος (paromoios - similar).
Therefore, to get a precise Greek translation, please specify the meaning of "favor" you intend.