It is a common noun when you are talking about a schoolhouse in general terms. There are also some hotels and restaurants and such places that are called the Schoolhouse. In those instances they are proper nouns.
Yes, "one-room schoolhouse" has hyphens. The hyphen is used to connect the words "one" and "room" to indicate that they work together as a single adjective describing the noun "schoolhouse." This formation clarifies that it is a schoolhouse with only one room.
Common noun
common
Pea is a common noun, and peas is the plural...still a common noun.
A common noun.
Most definitely a common noun.
Camel is a common noun.
Th word tail is a common noun because the first letter of a proper noun is capitalized.
Sonic's Schoolhouse was created in 1996-11.
it is re@lly @ common noun
common
The noun cassette is a common noun.