Medieval People: A
Alderman
An assistant to the mayor
Almoner
A medieval social worker who ensured the poor received the alms that they were due
Apprentice
See Mason
Archer

A fighting soldier armed with a longbow who normally fought in a large group from behind a barrier. A skilful archer could fire 10 to 15 arrows per minute and was well respected
Architect
A building designer. Plans would be worked out for each different building, depending on the geography of the site and the needs of the person employing him

Atilliator
A maker of crossbows