mek

As a noun initialism

is a term formed from the initial letter or letters of several words or parts of words, but which is itself pronounced letter by letter.

As an initialism mek is

(organic compound) methyl ethyl ketone.

In organic compound terms the difference between mek and toluene

is that mek is methyl ethyl ketone while toluene is a colourless, inflammable liquid hydrocarbon, methylbenzene, CH₃.C₆H₅, used as a solvent, in high-octane fuels and in the production of many chemical compounds.

As an initialism MEK

is methyl ethyl ketone.

As a noun toluene is

a colourless, inflammable liquid hydrocarbon, methylbenzene, CH₃.C₆H₅, used as a solvent, in high-octane fuels and in the production of many chemical compounds.

Mpk is likely misspelled.

Mpk has no English definition.

As an initialism MEK

is methyl ethyl ketone.

As a noun taxonomy

is the science or the technique used to make a classification.

As an initialism mek is

(organic compound) methyl ethyl ketone.

As an initialism MEK

is methyl ethyl ketone.

As an abbreviation MIBK is

methyl isobutyl ketone.