What are the words without vowels letters?

You're asking for words that have no vowels! This is a bit tricky, as every English word needs at least one vowel sound.

Here's why:

* Vowels are essential for sound: Vowels form the core of syllables, and syllables are the building blocks of words. Without vowels, words wouldn't be pronounceable.

* English grammar requires vowels: Even words like "shh" or "psst" technically rely on the sound of a vowel to be understood.

However, there are a few exceptions:

* Proper nouns: Some names like "Smythe" or "Wynn" technically don't contain a vowel letter, but they are pronounced with vowel sounds.

* Technical terms: In technical contexts, you might see abbreviations like "br" (for "bridge") or "ph" (for "phosphorus") where vowel letters are omitted.

Let me know if you'd like to explore other word puzzles or linguistic curiosities!