Acrid is related to smell like a gas or chemical. A handy tip is Acid is a chemical which is smelly and it sounds like the word Acrid. Pungent is strong and is also related to smell like a strong smell of Roses could be described as a pungent smell of Roses. Bitter is a unique type of taste also like when u taste unsweetened coffee it is quite bitter. It is the opposite of sweet. People might use the word bitter to describe a person as being mean and negative.

Acrid is a bad odor, which is sour or bitter, and harsh or sharp. Pungent is a strong odor (not necessarily bad). Bitter is one of the 5 flavors - like the taste of orange peel, coffee, or hops.