I think you're right. These defs are out of the exam cram Ora-8 DBA exam:
ACCEPT : Reads a line of input and stores it in a variable
CHANGE : Changes text on the current line in the buffer
DESCRIBE Lists the column definitions for the specified table, view or synonym or the specifications for the specified function or proc.
LIST : lists one or more lines of the sql buffer
UPDATE: Not there. Not necessarily a sqlplus command.