First, the content is different.

There are seventeen classifications of 1 and fourteen rhymes.

There are eighteen types of eighteen rhymes.

Second, the publication time is different.

1 and Eighteen Rhymes were listed by the National Government of the Republic of China as 194 1, 10, 10.

2. In August 2003, 14 verse was included in the 17th China Poetry Symposium.

Third, the nature is different.

1 and eighteen rhymes are used to write ancient poems. Conform to the rhythm of ancient poetry writing.

2. Fourteen rhymes are more in line with the rhythm of modern people.

Extended data:

Rhyme is divided by phonetic notation in Chinese Pinyin, and vowels can be divided into three parts: rhyme head, rhyme belly and rhyme ending.

The I, U and U parts at the beginning of vowels are called vowels; The vowel part after the rhyme head is the main part of vowel pronunciation, such as A in ua, E in ei and O in iou, which is called rhyme belly. The consonant part behind the rhyme belly, that is, n and ng, is called the rhyme ending. Rhyme belly and rhyme ending are the full names of rhymes.

Some vowels don't rhyme, only rhyme. Some vowels have no ending, and the belly is the rhyme. Obviously, words with the same rhyme and pronunciation are harmonious and unified to read, so they rhyme.

The so-called "homophony" means that words with homophony belong to homophony department. In this way, the division of phonology has a clear and operable standard and scale, which makes it have a scientific basis. Considering the specific situation of using English letters in Chinese Pinyin, some adjustments have been made to individual specific situations when judging "isomorphism".