Is there a word on this page that stands out as the most common?The most common word for your search is 'extra'.
How many actual words could one make with this combination of letters?There are up to 121 words.
Which is the most unique word that ends with 'tra'?Standing as the most peculiar word on this page is 'rostra'. 'Rostra''s definition is "See Rostrum, 2.", according to the dictionary.
How many letters does the biggest word from this list consist of?The word 'hydrophysometra' is made up of 15 characters.
What is the highest scoring word you can play in Scrabble ?Since there are a massive 121 entries, your best choice is to go for 'zygantra' which scores 21 points.