What is the difference between “keyword” and “reserved word”?

Question

What\'s the difference between a keyword and a reserved word?

For example, in the proposal for concepts in C++ one can read the following statement

Answer 1

Reserved words and keywords are mostly the same and they have pre-defined meanings in GW-BASIC...these have pre-defined uses and cannot be used or re-defined for any other purpose in Basic. Keywords cannot be used as a variable name. Some of the keywords of Basic are...IF, THEN, WHILE etc..