Here is a list of the reserved keywords in LPC. This list was taken from the 1.15.3 driver; other drivers might reserve more, or less, keywords.
| _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_verb |
| 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_file |