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

What is the max number of words you're able to assemble using this list?
It's possible to derive 36 words using the combination you asked for.

What is the longest word you can create from the combination of letters specified?
The biggest word found by Dictionarypedia is 'weltanschauungen'.

Which word from this list is the most unusual?
You'll note many weird words on this page, although our favorite word at the moment is 'wellhead'. The popular definition of 'wellhead' is as follows: "A source, spring, or fountain. At the wellhead the purest streams arise. Spenser. Our public-school and university life is a great wellhead of new and irresponsible words. Earle.".

In Scrabble, what is the most points you can get using this list of words that start with 'wel' and contain 'a'?
For 18 points in Scrabble, you could play 'welsbach'.

Which word on this page sticks out as the most common?
As far as well-known words go, there's 'welfare' which is the 5633^rd most popular word.