Final answer:
In English spelling, there is no strict rule against specific letters at the end of words, but it is less common for X and Z to appear at the end. Both vowels and consonants, including Y and W, can end English words, while u can be a consonant after q.
Step-by-step explanation:
The question asks which letters are not allowed at the ends of words in English spelling. There is no straightforward restriction in English that completely forbids particular letters from being at the end of words. However, certain conventions are generally observed. For instance, the letters X and Z are less common at the ends of English words but are not entirely disallowed. Letters such as Y and W often appear at the end of English words, with Y commonly used as a vowel suffix (e.g., 'happy') and W occurring in words like 'saw'. Vowels and consonants can both appear at the ends of words, although the usage depends on spelling conventions and pronunciation patterns in English. An example for vowels ending words includes 'go', and for consonants, 'help'.
The English alphabet consists of letters that are always vowels: a, e, i, o, and sometimes u. Letters such as y, w, and u can act as either vowels or consonants depending on their position and the letters they are combined with in a word. For example, w is a consonant in the word 'wind' but acts as part of a vowel team in 'how'. Similarly, u is a consonant when it follows a q, as in 'quick'.