We don't have synonyms for rakhi yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are takhi, raki and rashi.
(n) :
(chiefly South Asia, Indian subcontinent) An ornamental cotton wristband tied by a girl or woman on to the wrist of her brother, or of one who takes on the responsibilities of a brother, particularly during the Raksha Bandhan festival.
(n) :
(chiefly South Asia, Indian subcontinent) An ornamental cotton wristband tied by a girl or woman on to the wrist of her brother, or of one who takes on the responsibilities of a brother, particularly during the Raksha Bandhan festival.