A letter like P or D, where some part of the mouth is blocked off to make the sound, is called this simple word of cessation
[DOC] [TLE] 10 Words You Mispronounce That Make People Think You're an ... [PAR] Sep 1, 2008 ... People are starving and we are discussing Pronunciation and Spelling of .... 
And yes, irregardless is a simple idiocy.