Edit: [Steven's answer][1] 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 4 letters. (From Matthew and Steven)     
>! 3. Chips - ?  
>! 4. demos - Starts with a lowercase letter.   
>! 5. First - The only one with 3 consecutive consonants?  
>! 6. Gloss - The only one with a double letter (ss).  
>! 7. Begin - Does not follow the alphabetical order of the words. (From Steven)   
>! 8. Pages - Only one whose letters are not in alphabetical order.  

Old answer:  
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]: https://puzzling.stackexchange.com/a/62153/41007