What is the longest word starting with a?

Abbey, about, above, absorb, abuzz,

accomplish, accept, acquire, across, act, activate, actor, acute,

adage, adapt add, address, administer, admit, adopt, adore, adult,

advise, afloat, afraid, after, again, age, agent, aglow, agony,

ahead, aid, aim, air, airbag, aisle, alumni, always, alarm, ale,

alert, all, allow, alp, alter, amend, amount, amuse, analyze,

angel, announce, annoy, annual, answer, ant, anticipate, antler,

any, ape, apologize, appeal, Apple, appoint, apt, apron, arc, are,

argue, arm, arson, art, ask, asparagus, asphalt, assault, asset,

assignment, aster, asterisk, astronomy, asylum, ate, atlas, atom,

attack, attic, attract, audit, aunt, austerity, author, authority,

auto, autumn, avenue, avert, aviation, avocado, award, awful, awe,

axe and azalea are Words. They begin with the letter a.