Yes, cache is a Scrabble word!

...and is worth 12 points in Scrabble, and 13 points in Words with Friends

cache

Verb

1. Save up as for future use

Noun

1. A hidden storage space (for money or provisions or weapons)

2. A secret store of valuables or money

3. (computer science) RAM memory that is set aside as a specialized buffer storage that is continually updated; used to optimize data transfers between system elements with different characteristics

What Scrabble words can I make with the letters in cache?

4 Letter Words

ache
ceca
each

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Words that can be created with an extra letter added to cache: