noun

In the sentence 'The cat sat on the mat', 'cat' and 'mat' are nouns.

(Chinese) 在“猫坐在垫子上”这个句子中，“cat”和“mat”是名词。

Proper nouns, like 'London' or 'Sarah', should always be capitalized.

(Chinese) 专有名词，如“London”或“Sarah”，应始终大写。