The List
There are 267 4 letter words with A as the first letter. The highest scoring is AZYM at 18 points in Scrabble. 32 carry three or more vowels, which makes them useful for dumping a vowel-clogged rack.
AAHSAALSABACABASABBAABBEABBSABEDABETABIDABLEABLYABOSABRIABUTABYEABYSACAIACCAACEDACERACESACHEACHYACIDACMEACNEACREACTAACTSACYLADAWADDSADDYADITADOSADRYADZEAEONAEROAERYAESCAFARAFFYAFROAGARAGASAGEDAGEEAGENAGERAGESAGHAAGINAGIOAGLUAGLYAGMAAGOGAGONAGUEAHEDAHEMAHISAHOYAIASAIDAAIDEAIDSAIGAAILSAIMSAINEAINSAIRNAIRSAIRTAIRYAITSAITUAJARAJEEAKASAKEDAKEEAKESAKINALAEALANALAPALARALASALAYALBAALBEALBSALCOALECALEEALEFALESALEWALFAALFSALGAALIFALITALKOALKYALLSALLYALMAALMEALMSALODALOEALOOALOWALPSALSOALTOALTSALUMALUSAMAHAMASAMBOAMENAMESAMIAAMIDAMIEAMINAMIRAMISAMLAAMMOAMOKAMPSAMUSAMYLANANANASANCEANDSANESANEWANGAANILANISANKHANNAANNOANNSANOAANONANOWANSAANTAANTEANTIANTSAPAYAPEDAPERAPESAPEXAPODAPOSAPPSAPSEAPSOAPTSAQUAARAKARARARBAARBSARCHARCOARCSARDSAREAAREDAREGARESARETAREWARFSARGHARIAARIDARILARISARKSARLEARMSARMYARNAAROWARPAARSYARTIARTSARTYARUMARVOARYLASARASCIASEAASHYASKSASPSATAPATESATMAATOCATOKATOMATOPATUAAUASAUFSAUKSAULAAULDAUNEAUNTAURAAUTOAVALAVASAVELAVERAVESAVIDAVOSAVOWAWAYAWDLAWEDAWEEAWESAWFYAWKSAWLSAWNSAWNYAWOLAWRYAXALAXEDAXELAXESAXILAXISAXLEAXONAYAHAYESAYINAYREAYUSAZANAZONAZYM