Chareidi is broader. Yeshivish is a type of Chareidi. So is Hasidisch or Sefardi.
The terms are ill defined. Most human beings tend to fit into their surroundings. If you hang out in a hareidi environoment, you wake up one morning and discover and go to work and notice the people in the “normal” world all seem to be a bit strange, and when you get home you feel relieved to be back when everyone is normal.