One Vowel and Four Consonants
For fun with Common Lisp and to help solve a certain puzzle - but just a little bit - I wrote a set of tools to analyse words of just five letters.
My source list is based on Hunspell's en_GB.dic. This dictionary list is available as open source under the MPL. I created my own copy, removed lots of words starting with or containing capitals, Roman numerals, at least 444 duplicates1, and then some other words.
From this sub-set, I see that there are some 667 English words that consist of one vowel and four consonants. In the REPL my utilities can break this down further, like this:
| vowel | number of words with just this vowel | sample word |
|---|---|---|
| a | 192 | swank |
| e | 88 | spell |
| i | 165 | pitch |
| o | 106 | clown |
| u | 104 | thumb |
| y | 12 | glyph |
The list of five-letter words that have 4 vowels? That would be this:
("youse" "yahoo" "queue" "payee" "hooey" "eyrie" "eerie" "bayou"
"aurei" "audio" "aerie" "adieu" "abaya")To round off this post, there is this plot of five letter words versus their number of vowels. Hdqrs, with only consonants, is an abbreviation. I should remove it from the list.

The graph is created from this table:
| # vowels | # words |
|---|---|
| 0 | 1 |
| 1 | 667 |
| 2 | 2647 |
| 3 | 662 |
| 4 | 13 |
| 5 | 0 |
| char | Hz |
|---|---|
| R | 1289 |
| S | 1108 |
| T | 1057 |
| L | 1019 |
| N | 958 |
| C | 718 |
| P | 651 |
| D | 622 |
| H | 621 |
| M | 576 |
| G | 511 |
| B | 471 |
| K | 390 |
| F | 328 |
| W | 289 |
| V | 228 |
| X | 95 |
| Z | 89 |
| J | 67 |
| Q | 54 |
Footnotes
Sample duplicate words include acquisition, affection, bundle, commercial, orthodox, and queue.