Words with 'p' as the first letter that end with 'ast'

What's the largest word you can derive using words that start with 'p' and end with 'ast'?
'Protohematoblast' contains 16 characters, and is the longest word you could make from this list.

What's a peculiar word from the word combos possible on this list?
Our favorite unusual word from this list is 'portlast'. According to the Oxford dictionary, 'portlast' is defined as "The portoise. See Portoise.".

What is the highest scoring word in Scrabble using the above combination ?
Our suggestion for a total score of 13 points is playing the word 'phantast'.

Which word that starts with 'p' and ends with 'ast' is the most common word?
There's 'past', which ranks as the 642^nd most popular word.

In total, how many words can one make using this combination of letters?
Overall, you can select from up to 35 words.