Words that contain 'a' and end in 'cs'

In total, how many words is it possible to make using the combination requested?
There are up to 549 words on this page.

Is there an example word from this page that could be deemed as unusual?
By far the most interesting word in this list is 'acoustics'. According to the Oxford dictionary, 'acoustics' means "The science of sounds, teaching their nature, phenomena, and laws. Acoustics, then, or the science of sound, is a very considerable branch of physics. Sir J. Herschel. Note: The science is, by some writers, divided, into diacoustics, which explains the properties of sounds coming directly from the ear; and catacoustica,...".

Is there a word on this page that stands out as the most common?
Rating as the 3684^th most popular word, you will want to ensure you have 'francs' written down.

How many letters does the largest word on this list consist of?
The longest word on this page is 'magnetofluidmechanics'. It consists of 21 letters.

In Scrabble, what's the highest number of points you can get using words that contain 'a' and end in 'cs'?
As there are tons of words to select from, it's best to try 'quadrics' scoring 20 points in total.