Word:

  grump

1. grump (n)
  a bad-tempered person.

Words derived from grump
grouch,  grumble,  scold

grump is an instance of
disagreeable person,  unpleasant person

Word and things that fall within grump
crab,  crabby person,  fire-eater,  hothead,  misanthrope,  misanthropist