Every word that manages a, e, i, o and u at least once. Membership is decided by a property of the word you can check yourself — its letters, its syllables or where its stress falls — applied to every entry in the corpus.
Commonest, longest and average syllables are measured across the 600 words carried on this page, ordered by how often each appears in everyday English.
1,117 entries match this rule. This page carries the first 600 of them, ranked by commonness, so the list stays readable and the page stays small. The rest are still in the dictionary — search for one, or browse the letter it starts with.
Definitions, subject classification and semantic relations come from WordNet. Syllable counts come from the CMU Pronouncing Dictionary where the word is recorded in it. Full sources and licences.