Words with 'oph' at the start and 'a' at the end

In total, how many words is it possible to make using these specific combinations of letters?
From this list of words beginning with 'oph' and ending with 'a', you have 23 brilliant combinations which are available.

In Scrabble, what is the highest number of points possible from words beginning with 'oph' and ending with 'a'?
From this combination of letters, one could make 'ophidia' for a total of 13 points.

What is an example of a unique word that starts with 'oph' and ends with 'a'?
Our favorite peculiar word from this page goes to 'ophiuroidea'. The dictionary defines it as "A class of star-shaped echinoderms having a disklike body, with slender, articulated arms, which are not grooved beneath and are often very fragile; -- called also Ophiuroida and Ophiuridea. See Illust. Under Brittle star.".

How many letters does the longest word on this page contain?
The longest word is 20 letters, which is 'ophthalmoblennorrhea'.