Words that start with 'ara' and contain 'd'

What is the max number of words one can put together from this combination of letters?
Altogether, it is feasible to make up to 34 words.

How many letters does the longest word from this list consist of?
The longest word is 13 letters, which is 'arachnoiditis'.

What is the highest possible score you could get in Scrabble from this list of words that start with 'ara' and contain 'd'?
For 20 points in Scrabble, you could use 'arabized'.

Is there a specific word from this page of word that starts with 'ara' and includes 'd' which could be deemed as unusual?
The most peculiar word from this list is 'arachnidium'. The typical definition of 'arachnidium' is as follows: "The glandular organ in which the material for the web of spiders is secreted.".