The difference between Quintessence and Whatness

When used as nouns, quintessence means a thing that is the most perfect example of its type, whereas whatness means essence.

Quintessence is also verb with the meaning: to reduce to its purest and most concentrated essence.

check bellow for the other definitions of Quintessence and Whatness

Quintessence as a noun:

A thing that is the most perfect example of its type; the most perfect embodiment of something; epitome, prototype.
Quintessence as a noun:

A pure substance.
Quintessence as a noun:

The essence of a thing in its purest and most concentrated form.
Quintessence as a noun (alchemy):

The fifth alchemical element, or essence, after earth, air, fire, and water
Quintessence as a noun (physics):

A hypothetical form of dark energy postulated to explain observations of an accelerating universe.

Quintessence as a verb (transitive):

To reduce to its purest and most concentrated essence.