Words that start with 'o' and contain 'bd'

What is the most common word that starts with 'o' and includes 'bd'?
We've identified that 'obdurate' is the 30237^th most common word.

How many viable words could one put together using this list?
On this list of words that start with 'o' and include 'bd', there are 17 effective entries which are possible.

How many characters are in the longest word from this page?
The word 'obdiplostemonous' contains 16 characters.

What's the highest scoring word you can play in Scrabble ?
For 16 points, you are able to use 'obduracy'.

What's an interesting word from all the word combos available ?
Our favorite strange word from this list is 'obduration'. The definition of 'obduration' is as follows: "A hardening of the heart; hardness of heart. [Obs.]".