How many letters are in the biggest word on this list?The biggest word on this list is 'preacknowledgement'. It consists of 18 letters.
What is an example of a unique word from this list?By far the most strange word from this list is 'presagement'. It means "1. The act or art of presaging; a foreboding. [R.] Sir T. Browne. 2. That which is presaged, or foretold. [R.] "Ominous presagement before his end. " Sir H. Wotton.".
In total, how many words are there using the combination requested?From this page of words that start with 'p' and include 'gem', there are 14 fantastic entries which are possible.