Generally speaking, as long as the rhyme ending is the same and the rhyme belly is the same or similar, the rhyme head is not considered. The rhyme in metrical poems is different from that in modern Mandarin and Xinhua Dictionary. Some words have the same pronunciation and vowels, but they don't belong to the same rhyme. And some words look different in pronunciation, but you look them up in Phonology and Rhyme, but they belong to the same rhyme department.
Therefore, to write metrical poems, we must first master some simple phonological knowledge. It may be easier for southerners to learn to write metrical poems than northerners, because there are still some ancient sounds in some dialects in Wu, Fujian and Guangdong today, and many of these ancient sounds belong to the same rhyme department in The Compendium of Rhyme.
Extended data
There are three types of vowels: rhyme head, rhyme belly and rhyme ending. Those with the same rhyme ending, the same rhyme belly or similar rhyme belly belong to the same category, no matter what the rhyme head is. In this way, each word can include one to five vowels, as follows:
(1) Rana hirsuta contains words with vowels of A, ia and, such as "hair, home and flower".
(2) Words containing vowels such as e, o and uo, such as "ge, bo and suo".
⑶ Oblique words also include words with Mi, ie and üe as vowels, such as "love, thanks and joy".
(4) Gusu contains words with U as vowel, such as "Gusu".
5. Clothing dates include vowels I and ü, such as "clothing, food and clothing".
⑹ Huailai contains words with ai and uai as vowels, such as "Lai, Huai".
(7) The ash pile contains words with vowels of ei and ui, such as "sadness and ash".
⑻ Yaotiao contains words with ao and iao as vowels, such as "Gao, Yao".
(9) Congqiu rhyme includes words with ou and iu vowels, such as "Congqiu".
⑽ Precedents include words with an, ian, uan, and Luan as vowels, such as "Ban, Qian, Duan, Yuan".