How is a mole similar to a dozen?
A mole is similar to a dozen, because both are words used to describe a specific number of countable things.
"Dozen", "score", and "mole" are words that describe a specific number of objects.
Avogadro did not invent the mole, but the number of particles in a mole is called Avogadro's number in his honour.
This amazing video by Tyler DeWitt gives an introduction to moles: