Words with 'ef' at the start and 's' at the end

What word from this list is the most interesting?
'Effectiveness' certainly stands as the most peculiar word in our list of words that start with 'ef' and end with 's'. According to the Oxford dictionary, 'effectiveness' is defined as "The quality of being effective.".

What's the longest word you can construct using this list?
The longest word found by our team is 'efficaciousness'. It consists of 15 characters.

What is the highest possible score you could get in Scrabble using this list of words that start with 'ef' and end with 's'?
For 21 points in Scrabble, you could use 'effluxes'.

What is the max number of words you could create using this list?
From this page of words that start with 'ef' and end with 's', there are 46 unique combinations that are possible.

Which word that starts with 'ef' and ends with 's' is the most popular word in the dictionary?
As far as well-known words go, there's 'efforts', which ranks as the 1051^st most popular word.