Yes, quipus is a Scrabble word!
...and is worth 17 points in Scrabble, and 20 points in Words with Friends
quipus
Noun
1. Calculator consisting of a cord with attached cords; used by ancient Peruvians for calculating and keeping records
What Scrabble words can I make with the letters in quipus?
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Words that can be created with an extra letter added to quipus:
P:quippus