What is the most common word for this page?A popular word for your request is 'first'.
What's the biggest word you can derive from this list?'Antienvironmentalist' is the largest word that the Dictionarypedia database could construct.
Is there an example of a word from this page of word that has 'ir' in and ends with 't' which might be considered as unique?The most strange word in this list is 'clairvoyant'. According to the Oxford dictionary, 'clairvoyant' is defined as "Pertaining to clairvoyance; discerning objects while in a mesmeric state which are not present to the senses. One who is able, when in a mesmeric state, to discern objects not present to the senses.".
In total, how many words are there using the combination of letters requested?There are 395 entries.
What is the highest number of points you're able to get in Scrabble using this list of words that contain 'ir' and end in 't'?As there are a considerable 395 entries, you may want to go for 'besquirt' which scores 19 points.