The assembler has reserved words.  Reserve word cannot be used in symbol, label, section name, macro name.  If a reserved word is specified, the CC-RH outputs the message and stops assembling.  Reserve word doesn't distinguish between uppercase and lowercase.
 
The reserved words are as follows.
-  | Instructions (such as add, sub, and mov)  | 
 
-  | Register names, Internal register name  | 
 
-  | GHS reserved sections ("_GHS", ".ghs", and section names starting with ".__ghs")  |