Yes, the noun 'family' is a common noun, a word for any related group of people or things.
A proper noun is the name of a specific person, place, thing, or a title; for example:
Jill E. Family, Associate Professor of Law, Widener University School of Law, Harrisburg, PA
Family Street, Fayetteville, NC or Family Circle, San Diego, CA
Family Dollar Stores, Inc.
"Family Business", 1989 move with Sean Connery and Dustin Hoffman
No. It is a proper noun which means that it should always be capitalized. You should always right it as Buckingham Palace.
Fernando Poe Jr. was born on August 20, 1939.
The proper noun is Philippines; the common noun is country.
The common noun for the proper noun China is country.
many is not any kind of a noun. It is an adjective that describes something. Many people, many animals, many banks, etc.
No, the word 'busiest' is the superlative form of the adjective busy (busier, busiest).
The abstract noun form of the adjective 'busy' is business.
The common noun for the word Mongol is person or people of Mongolia. The word Mongol is a proper noun and must be capitalized.
The common noun is dog.
The word Christmas is a proper noun, the word carol is a common noun; the compound noun Christmas carol is a proper noun. "A Christmas Carol" by Charles Dickens is a proper noun, a title.
There is no specific collective noun for castles, most likely because castles are seldom found in a group. When there is no collective noun, a noun suitable for the situation is used, for example a cluster of castles, a chain of castles, a choice of castles, etc.
Yes, the plural noun 'engines' is a common noun, a general word for any machines with moving parts that convert power into motion; a general word for a vehicles that pull trains.
There is a monument in Paris. (monument is common, Paris is proper)
Teacher is a common noun.
The noun 'man' is a common noun, a general word for any adult human male; a word for a person.
Common