It is a common noun when it refers to the star in the centre of any solar system. It's also a countable noun (which means it can be pluralized: "suns").

6 авг. 2015 г. · It is both a common noun and a proper noun. When it is used to refer to "our" Sun (the one at the centre of our solar system) it is a proper noun. Are “sun”, “moon”, and “earth” common or proper nouns? - Quora Why is the Sun called a common noun? Why not proper noun? Sun rise a common noun or a proper noun? - Quora Другие результаты с сайта www.quora.com

25 июл. 2010 г. · The sun that warms us and the moon we see circling the earth on which we live are all lower case nouns. Their proper names are Sol and Luna. This earth is ...

8 мая 2022 г. · It can be used as both a proper noun and a common noun. The star at the center of our solar system is "the Sun." Other galaxies may have stars ...

(Here, "suns" is a common noun, but "The Sun" (the name of our sun) is a proper noun. That's why it has a capital letter.)

2 июл. 2021 г. · Proper nouns are distinguished with a capital initial letter. For example: Sun / sun. Moon / moon. God / god. Superman / super man.

17 апр. 2018 г. · Yes, but there are exceptions; Explanation: When nouns such as "earth", "sun", "moon", "Mars", and et cetera are used in an astronomical context they are ...

As detailed above, 'sun' can be a proper noun, a noun or a verb. Verb usage: Beautiful bodies lying on the beach, sunning their bronzed limbs.

17 авг. 2021 г. · In English, "sun" and "moon" are treated as common nouns. A sun and a moon are kinds of things, but the sky only happens to have one of each.