在文法上,noun和phrase除了字數的分別外,還有其他嗎?

yes. Noun(名詞) is only refer to an object, it is one of the part of speech, for example, besides of noun, part of speech can also devide into adjectives and verb etc.In the other words, noun can not really mean 'a word'
But Phrase means 詞組,it really means 'a word' for examples, pen is a phrase, but it also is a noun ,

what da ....