Their name also denotes the practical nature of their work. They are servants. But practical work is spiritual work when done for Christ and the kingdom.
“Whom we may put in charge”
Stephen and Phillip, for instance, were deacons who also had other gifting. As deacons, however, they functioned in a practical way. Deacons are not limited to practical service, but must be engaged in practical service to be deacons. Deacons are not required to be evangelists like Phillip or preachers like Stephen.