Somewhat Most, Somewhat Least

A most peculiar  
    popular
    population
   presupposes
   perceptions
  preclude
parsimonious prattle.

The least salient
    salacious
     surreptitious 
    serendipitous 
    scandals 
     sallow
  seared 
  salmon
superciliousness.

Somewhat omniscient 
      oracles  
      opine
     officious
     oleanders 
     of
     orangey 
   ouroboros 
   obsolescence  
  onto
obliquity's honorific.