No, it is not a noun. Arid is an adjective. The noun forms would be aridness or aridity.
The noun form of the adjective 'arid' is aridity.
Noun forms for the adjective arid are aridity and aridness.
The two similar words are :desert - (noun, verb) arid land, or to abandondessert - (noun) serving course at the end of, or after a meal
"Mesa" is a noun. It refers to a flat-topped landform with steep sides, often found in arid regions.
The opposite of moist is dry or dried, but could also be parched or arid depending on the noun being modified.
A mesa is a flat piece of land that is higher than other pieces of land. It is a noun.
The proper noun is Nullarbor ("treeless"), a semi-arid region of coastal Southern Australia. It is mostly a large limestone plain.
The spelling savanna is an arid, grassy plain as found in Africa.The spelling Savannah is a proper noun, a port city in South Carolina.
main characteristics of the vegetation of arid and semi arid regions
Arid & Semi-Arid
Arid
Deserts are arid. There is no such thing as a 'semi-arid' desert. Semi-arid regions are steppes or grasslands.