Traditionally a telegraphist always used morse code for communications. At the beginning on the railways, Western Union, and the Fargo networks and all on landline. The Navy trade of telegraphist was a person engaged only in morse code communications.

Radio Officers handbook clearly defines the the meaning of telegraphist and the morse speed required send/receive for a 1st, 2nd and Special Operator certificate

1st Class 25 wpm, 2nd Class 20 wpm and Special 20 wpm with less theory mainly for certain trawlers.

The aeronautical manual MCAP5 also makes it quite clear what telegraphist means and the morse speed required is 25wpm.

The handbook is issued by HM Government and an official document and their defination of Telegraphist, therefore it is irrevelant what a dictonary says.

The present licence issuing authority ie OFCOM will let you have their defination of Telegraphy, in fact the subject was discussed by them a while back  concerning modes for 5 Mhz NOV'S.

Do not be afraid to ask they are very helpful and its their defination that counts since they issue the 500 khz licence.