They are both theoretically dictionary coders.

It may be combined with other general lossless data compression techniques such as entropy encoding and dictionary coders to compress the remaining suffixes.

Some dictionary coders use a 'static dictionary', one whose full set of strings is determined before coding begins and does not change during the coding process.

A dictionary coder, also sometimes known as a substitution coder, is a class of lossless data compression algorithms which operate by searching for matches between the text to be compressed and a set of strings contained in a data structure (called the 'dictionary') maintained by the encoder.