Which word on this page has the highest character count?The longest word you could derive from this list is 'febricitation', which is made up of 13 characters.
What's an unusual word from all the combinations available ?By far the most strange word from this list is 'februation'. It means "Purification; a sacrifice. [Obs.] Spenser.".
How many words is it possible to make using the combination requested?From this page of words that start with 'feb' and include 'o', you have 6 effective combinations which are available.