Words that contain 'ni' and end in 'ps'

What is the largest word you can derive from the combination searched for?
The word 'nincompoops' has 11 characters.

What's the most popular word on this page?
'Turnips' is the most well-known word from this that have 'ni' in and end with 'ps', ranked 22084^th most common word.

How many acceptable words could one make with words that have 'ni' in and end with 'ps'?
From this list of words that contain 'ni' and end in 'ps', Dictionarypedia has discovered 12 entries which are available.

In Scrabble, what's the highest score possible from this list of words that contain 'ni' and end in 'ps'?
For 19 points in Scrabble, it's possible to use 'janiceps'.