In total, how many words are there using the combination of letters specified?There are up to 8 entries which address your query.
How many letters does the longest word from this page contain?There are 16 letters in the word 'refrangibilities', making it the longest word we have.
Which word that starts with 'r' and includes 'gib' is the most unusual?Standing as the most interesting word on this page is 'refrangible'. According to the dictionary, 'refrangible' means "Capable of being refracted, or turned out of a direct course, in passing from one medium to another, as rays of light. -- Re*fran"gi*ble*ness, n.".