Words that contain 'ap' and end in 's'

What is the longest word you can construct using this list?
The largest word assembled by our team is 'electroencephalographs'.

What's the highest scoring word in Scrabble with the above combination ?
With numerous words to decide on, your best option is 'zaptiahs' which scores 22 points overall.

What word that has 'ap' in and ends with 's' is the most interesting?
One of the most peculiar words from this list of words that have 'ap' in and end with 's' is 'trapes'. 'Trapes''s definition is "A slattern; an idle, sluttish, or untidy woman. [Obs. Or Colloq.] To go about in an idle or slatternly fashion; to trape; to traipse. [Colloq.] Thackeray.", according to the English dictionary.

What's the most common word for this page?
Ranking as the 392^nd most common word, you will want to make sure you have 'perhaps' in your arsenal.

In total, how many words are available using these particular combinations of letters?
There are 1,890 words overall.