The best replacement for granddaughter is granddaughter.

The best alternatives to granddaughter are rated as following:
★★★★★  granddaughter
★★★★  grand daughter
★★★  grandaughter
★  grand-daughter

Your alternative for granddaughter is not listed? Suggest!
Speaking about granddaughter, one probably shouldn't forget about grandpa.

Other search terms related to granddaughter and their ratings are:
★★★★★ grandpa
You have in mind a companion for granddaughter and it is not yet here? Propose!



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grand daughter