• no random tests
• the sample tests expect a different behavior from the full test suite (empty string)
• behavior for apostrophe and hyphens have to be talked about in the description
• the input validation doesn't make any sense.
• WHY is the user given an array of strings from time to time?? I hope for your future colleagues you'll never actually design functions that way... ;s

If you're interesetd at authoring kata, read the whole documentation about it before your next attempt, plz.

cheers

PS: and this time, don't close the issue unless you actually fixed the problems, thx.

• Description does not specify what constitues a word

• Function with multiple inputs are considered bad practice