No the word plain is not a noun. It is an adjective.
Plain is a common noun and can also be an adjective.
As an adjective, ordinary. As a noun relating to land, a plain is an area of land not significantly higher than adjacent areas and with relatively minor differences in elevation, such as a flood plain along a river or the Great Plains of the Mid-western United States.
outwash plain
Lava plain
what is the symbol on a map to show plain
Plain is a common noun and can also be an adjective.
No. Plain is a noun, or an adjective. The adjective plain has the adverb form "plainly."
The part of speech for "inclined plane" is a noun.
"Plain folks" is a noun phrase. It refers to ordinary or average people in society.
A is an article, grassy is an adjective, and plain is a noun.
The word 'savanna' is a noun, a singular, common, concrete noun; a word for a grassy plain with a few trees; a word for a thing.
One homograph for "plain" is a noun meaning a large area of flat land. Another homograph is an adjective meaning simple or not fancy.
When it describes a noun. "Block" letters are plain capital letters.
As a noun plain means flat land, the plural is plainsThey looked across the plains but could see no sign of the wagons.Plain as an adjective can mean:unmixed, pure - I'll have a plain cracker thanksnot complicated, simple - She wore a plain blue dress. (same as pizza above)clearly understood, obvious - He made his intentions plain to all
The noun 'pen pal' is a:singular nouncommon nouncompound nounconcrete noun (a word for a person)
The noun simplicity is an abstract noun; a word for the quality or condition of being easy to understand or do, being plain or natural.
It would only be proper if it was the name of place. If it was the name of the restaraunt, like Playground Bar and Grill, it would be a proper noun. If you are just going to the playground down the street, it would be a plain old common noun. This is usually the case.