From the NannyMUD documentation
2000-12-16
NAME
keywords - Reserved words.DESCRIPTION
The following identifiers are reserved for use as keywords, and may not be used for any other purpose: _acl_access _acl_debug _acl_get _acl_modify _acl_num2str _acl_put _acl_query_access _acl_str2num _cache_stats _chmod _destruct _disconnect _driver_stat _dump_file_descriptors _file_stat _find_shortest_path _fuzzymatch _get_clone_by_number _get_spec_obj _isclone _lock _m_delete _next_clone _object_cpu _object_memory _object_stat _query_action _query_ed _rusage _set_prompt _syslog _wiz_list_info add_action add_verb add_worth add_xverb all_inventory allocate assoc atoi break break_point call_other call_out call_out_info capitalize case cat catch clear_bit clone_object command continue create_wizard creator crypt ctime debug_info deep_inventory default destruct disable_commands do dump_socket_status ed else enable_commands environment exec explode extract file_name file_size filter_array filter_mapping find_call_out find_living find_object find_player first_inventory float for foreach function_exists get_dir glob if implode inherit inherit_list input_to insert_alist int interactive intersect_alist intp living localcmd log_file lower_case m_delete m_indices m_sizeof m_values map_array map_mapping mapping mappingp member_array mixed mkdir mkmapping move_object next_inventory next_living nomask notify_fail object objectp order_alist parse_command pointerp present previous_object private process_string protected public query_host_name query_idle query_ip_number query_ip_port query_load_average query_snoop query_verb random read_bytes read_file regexp remove_call_out rename replace restore_object return rm rmdir save_object say set_bit set_heart_beat set_light set_living_name shadow shared shout shutdown sizeof snoop socket_accept socket_acquire socket_address socket_bind socket_close socket_connect socket_create socket_error socket_listen socket_release socket_write sort_array sprintf sscanf static status string stringp strlen swap switch tail tell_object tell_room test_bit this_object this_player throw time trace traceprefix transfer unique_array upper_case users varargs version void while wizlist write write_bytes write_fileNOTE
This list is accurate for the 1.5.3 driver.