There are thousands of possibilities. A few off the top of my head:
revel and lever
small and malls
creep and crepe
perfect and prefect
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similar, same, indifferent,
Different, dissimilar, unlike, change, or variable. Those words are opposite of same.
(!7)/(!2.!2) =1260
It would depend on the letters in the word. The theoretical maximum is 325 words from 5 different letters: 120 five-letter words, 120 four-letter words, 60 three-letter words, 20 two-letter words, 5 one-letter words (including acronyms) made by listing the letters in every possible order (abcde, abced, ..., edcba and ending with a, b, c, d, e). For most sets of 5 letters, the number is a fraction of that, from 20 to 40 words.
The answer depends on how many letter tiles you have and which letters are on those tiles.