Is Mercator a Noun?

Mercator is a noun. A noun is a type of word the meaning of which determines reality. Nouns provide the names for all things: people, objects, sensations, feelings, etc.

What does Mercator mean?

: a conformal map projection of which the meridians are usually drawn parallel to each other and the parallels of latitude are straight lines whose distance from each other increases with their distance from the equator.

What is the noun form of vex?

Vex can be used as an adjective: for example, a vexing issue is not easily solved. The verb vex, the corresponding adjective vexatious, and the noun vexation are all slightly old-fashioned though still in current use. Vex descends through Middle English from Latin vexare, "to shake, attack, trouble."