People have done experiments before, using some odd or made up word, and found that Amazon doesn't search blurbs for keywords. I believe this is why so many stack their titles full, since they are searched. Hint to Amazon: Want to end title stuffing? Stop making them searchable for keywords. Don't know how you'd get the bots to do it, but I'm not a programmer.
Google does search the blurbs, so you'd want to work in words that would help in searches. But, please, don't just list a bazillion words at the end of the blurb. Gods. That looks so tacky and gross. I saw one once that had at least a hundred words, with it all helpfully noted as 'keywords'.