Final answer:
When consonants and vowels match perfectly between words, it is known as consonance. Consonance is characterized by the repetition of consonant sounds and can also involve the doubling of consonants in certain spelling contexts.
Step-by-step explanation:
When consonants and vowels match perfectly between words, the term often used to describe this is consonance. Consonance refers to the repetition of consonant sounds at the end of words, but it can also involve the duplication of consonant sounds within or between words. For example, "the slithering snake shakes its little rattle" showcases consonance with the repeated 's' and 't' sounds. A special case of consonance is when you twin or double the final consonant of a word ending in the consonant-vowel-consonant pattern (CVC) when adding a suffix that starts with a vowel, as seen in words like "biggest" where the 'g' is doubled.
Four letters that are always vowels are <a>, <e>, <i>, and <o>. There are also three letters that can sometimes act as vowels and sometimes as consonants, these are <y>, <w>, and <u>. When analyzing the alphabet with the intent to distinguish vowels from consonants, we cross off these letters as they are the ones that could represent vowel sounds.