two related questions

(1)
is there a way of searching the list of terms in the index file, e.g. to see
that
"MyIndex" has the words (apple, pear, watermelon) in it?  (treating the
"index" as if it was a dictionary or thesarus)

some kind of api such as "start at word >= 'banana'", and "read next" would
do it (maybe a "give a count of total # words in the index")


(2)
is there any kind of fuzzy searching, e.g. "apple" with one spelling error
accepatable, e.g. "appie" would still match.


(3)
any support for "near", e.g. "apple" within 3 words of "banana"