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

In total, how many words could one make using these specific combinations of letters?
From this page of words starting with 'o' that contain 'bse', you have 72 entries which are available altogether.

How many letters does the longest word from this page consist of?
The longest word that's possible to construct from this list is 'overobsequiousness', which consists of 18 characters.

Is there an example of a word from this page which could be thought of as unique?
'Observantly' is certainly the most weird word in our list of words that start with 'o' and include 'bse'. It means "In an observant manner.".

In Scrabble, what is the highest number of points possible from this list of words that start with 'o' and contain 'bse'?
For a score of 21 points, one could play 'obsequy'.

Which word on this page is the most common?
The most common word is 'observed', which is actually the 1024^th most popular word in the dictionary.