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

Which word that starts with 'dip' and ends with 'a' is the most common word in the dictionary?
'Diploma' is the most well-known word from this that start with 'dip' and end with 'a', ranked 41497^th most common word.

What is an interesting word from this page of words that start with 'dip' and end with 'a'?
The most strange word in this list is 'diphtheria'. 'Diphtheria''s definition is "A very dangerous contagious disease in which the air passages, and especially the throat, become coated with a false membrane, produced by the solidification of an inflammatory exudation. Cf. Group.", according to the dictionary.

In total, how many words can one make using the combination requested?
35 words.

Which word in particular from this list is made up of the highest number of letters?
Consider 'diphenylthiourea'

What's the highest number of points you could get in Scrabble from this list of words beginning with 'dip' and ending with 'a'?
You could make 'diphylla' for a total of 17 in Scrabble.