Words that start with 'vis' and contain 'a'

What is the maximum number of words you are able to create using words that start with 'vis' and include 'a'?
88

Is there an example word from this page which might be deemed as interesting in any manner?
By far the most peculiar word from this list is 'visual'. According to the dictionary, 'visual' is defined as "1. Of or pertaining to sight; used in sight; serving as the instrument of seeing; as, the visual nerve. The air, nowhere so clear, sharpened his visual ray. Milton. 2. That can be seen; visible. [R.] Visual angle. (Opt.) See under Angle. -- Visual cone (Persp.), a cone whose vertex...".

What is the most common word that starts with 'vis' and includes 'a' in the dictionary?
Rating as the 6652^nd most popular word, you'll want to ensure that you have 'visage' memorized.

What's the best score you could get in Scrabble from this list of words that start with 'vis' and contain 'a'?
It is possible to make 'viscacha' which gets 18 in Scrabble.

How many characters are in the longest word from this list?
The largest word is 18 letters, which is 'visceripericardial'.