Words that start with 'j' and contain 'h'

Is there an example of a particular word from this page which might be considered as unique?
One example of a strange word from this list is 'jayhawker'. It is defined as "A name given to a free-booting, unenlisted, armed man or guerrilla. Note: [A term of opprobrium used in the war of 1861-65, u. S.]".

What's the longest word you can derive using this list?
The longest word on this list is 'jolterheadedness'. It has 16 characters.

What is the most popular word that starts with 'j' and includes 'h' in the dictionary?
The most common word is 'jacht', which in fact is the 87718^th most popular word in this list.

How many actual words can you make using words that start with 'j' and include 'h'?
From this list of words that start with 'j' and include 'h', there are 276 combinations that can be selected.

What's the highest score you could get in Scrabble using this list of words that start with 'j' and contain 'h'?
As there are an overwhelming 276 entries, your best bet is 'jizyah' scoring 28 points.