A computer is a common noun .
Common nouns are things that are just as the name suggests, common. An easy way to remember the difference are proper nouns are nouns you capitalize. States and people's names are two examples of proper nouns. Common noun examples include apple, monkey, and cell phone.
"Computer" is a common noun because it refers to a general type of device and not a specific one. Common nouns are not capitalized unless they start a sentence. Examples of proper nouns would be specific brands or names.
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