Words that start with 'i' and contain 'sc'

In total, how many words are there using this list?
You can make 315 words overall.

Which word that starts with 'i' and includes 'sc' is the most popular word?
'Inscription' is the most well-known word from this list, ranked 7637^th most common word.

Is there an example word from this page which might be considered as unusual?
Dictionarypedia feels 'indiscerpible' to be the most peculiar word you can assemble. It means "Not discerpible; inseparable. [Obs.] Bp. Butler. -- In`dis*cerp"i*ble*ness, n., in`dis*cerp"ti*ble*ness, n. [Obs.] -- In`dis*cerp"ti*bly, adv. [Obs.]".

What is the highest scoring word you can play in Scrabble ?
Since there are an extensive 315 entries, your best choice is to consider 'ischchia' which scores 18 points in total.

What is the longest word you can assemble with words that start with 'i' and include 'sc'?
There are 18 characters in the word 'immunofluorescence', that makes it the longest word Dictionarypedia has.