Edit: Steven's answer seems to be in the right direction, so here's my updated answer:
It seems that 7 of the 8 words have a property that makes them the 'odd one out', and we're looking for the one that doesn't have such a property.
1. Below - ?
2. Blot - Only has 4The only one that doesn't have 5 letters. (From MatthewMatthew and StevenSteven)
3. Chips - The only one that doesn't have an anagram. ?(Found by Rupert)
All other words: Elbow, Bolt, Modes, Frits, Slogs, Being, Gapes
4. demos - StartsThe only one that doesn't start with a lowercasecapital letter.
5. First - The only one with 3 consecutive consonants?
6. Gloss - The only one with a doubleduplicate letter (ss).
7. Begin - Does notThe only one in this list that doesn't follow the alphabetical order of the wordsitems,
OR the only one that cannot be turned into another word by removing one letter. (From StevenSteven)
All other words: Blow, Lot, Hips, Demo, Fist, Loss, Page
8. Pages - OnlyThe only one whose letters are not in alphabetical order.
OldAs such, it seems the best fit for the final answer: would be
The first thing noticed is of course
That 4. demos is the only one not capitalized
But of course, the title might suggest that this is just a red herring! Instead, I'm guessing the real answer is:
8. Pages
As it is the only one whose letters are not in alphabetical order.
1. Below.
Of course, with increasingly convoluted rules you will eventually find a way to make this word the odd one out instead. But I think this set of answers provide the simplest, most straightforward rules for all the other words.