Is there a word on this page that sticks out as the most common?As far as well-known words go, there's 'opinion', which is the 738th most popular word.
How many words can you put together using the combination specified?It is possible to assemble 390 words using the specified combination.
What is an unusual word that starts with 'op' and includes 'o'?Dictionarypedia feels that 'opinionate' to be the most peculiar word you can assemble. According to the Oxford dictionary, 'opinionate' means "Opinionated.".
How many characters does the biggest word on this list contain?The longest word you could assemble from this list is 'ophthalmoblennorrhea', and it consists of 20 characters.
In Scrabble, what is the best score possible from words that start with 'op' and include 'o'?As there are so many words to choose from, we would advise choosing 'opopanax' scoring 19 points in total.