How many letters does the biggest word from this page contain?The largest word you can derive from this list is 'arteriococcygeal', which contains 16 characters.
How many actual words could one make from this combination of letters?You could assemble 40 words using the combination you searched for.
What is an unusual word from all the combinations available on this list?One of the most interesting words from this list of words with 'ccy' in them is 'coccygeal'. The definition of 'coccygeal' is as follows: "Of or pertaining to the coccyx; as, the coccygeal vertebræ. Coccygeal glands (Zoöl.) , glands situated at the base of the tail of birds. They secrete the oil with which the plumage is dressed.". Source Cambridge Dictionary.
What's the best score you're able to get in Scrabble using this list of words that include 'ccy'?For 26 points, it's possible to use 'coccyzus'.