What is the most common word for this page?A well-known word for the combination you requested is 'coma'.
How many letters are in the longest word from this page?Consider 'commissoria'
How many usable words could one put together using this list?There are 32 words on our list of words that start with 'com' and end with 'a'.
What is the highest number of points you could get in Scrabble from this list of words that start with 'com' and end with 'a'?For 15 points, one could use 'comitiva'.
What's a peculiar word on this list?A good example of an unusual word from this list goes to 'comitia'. The dictionary defines it as "A public assembly of the Roman people for electing officers or passing laws. Note: There were three kinds of comitia: comitia curiata, or assembly of the patricians, who voted in curiæ; comitia centuriata, or assembly of the whole Roman people, who voted by centuries; and comitia tributa, or assembly of...".