How many viable words could one put together from this list?There are a maximum of 4 entries which address your query.
Is there a word from this page of word that starts with 'h' and includes 'edw' which might be deemed as unique in any manner?Arguably one of the most strange words from this list of words that start with 'h' and include 'edw' is 'hundredweight'. According to the Oxford dictionary, 'hundredweight' is defined as "A denomination of weight, containing 100, 112, or 120 pounds avoirdupois, according to differing laws or customs. By the legal standard of England it is 112 pounds. In most of the United States, both in practice and by law, it is 100 pounds avoirdupois, the corresponding ton of 2,000 pounds,...".
Which word that starts with 'h' and includes 'edw' is the most popular word?A well-known word for the combination you requested is 'hundredweight'.
What is the biggest word you can construct from this list?The longest word that's possible to derive from this list is 'hundredweights', which has 14 characters.