1. Transforming Double Letters:
- Consider the sequence of transformations for double letters:
$$aa \rightarrow bcbc \rightarrow bb$$
This shows that the double letter "aa" can be transformed into "bb". By applying the transformation rules cyclically, we can see that every double letter is equivalent to every other double letter. For example:
$$bb \rightarrow cdcd \rightarrow cc$$
$$cc \rightarrow dede \rightarrow dd$$
$$dd \rightarrow efef \rightarrow ee$$
$$ee \rightarrow fgfg \rightarrow ff$$
$$ff \rightarrow gaga \rightarrow gg$$
$$gg \rightarrow abab \rightarrow aa$$
This completes the cycle, showing that any double letter can be transformed into any other double letter.

2. Transforming Single Letters:
- Consider the sequence of transformations for single letters:
$$a \rightarrow bc \rightarrow cdde \rightarrow ccce \rightarrow eece \rightarrow ec \rightarrow ede \rightarrow d$$
This shows that the letter "a" can be transformed into the letter "d". By applying the transformation rules cyclically, we can see that every letter is equivalent to every other letter. For example:
$$b \rightarrow cd \rightarrow deef \rightarrow ddf \rightarrow fdf \rightarrow f$$
$$c \rightarrow de \rightarrow effg \rightarrow efg \rightarrow gfg \rightarrow g$$
$$d \rightarrow ef \rightarrow fgga \rightarrow fga \rightarrow gaa \rightarrow a$$
$$e \rightarrow fg \rightarrow gab \rightarrow gb \rightarrow bab \rightarrow b$$
$$f \rightarrow ga \rightarrow abbc \rightarrow abc \rightarrow bcc \rightarrow c$$
$$g \rightarrow ab \rightarrow bccd \rightarrow bcd \rightarrow cdd \rightarrow d$$
This completes the cycle, showing that any single letter can be transformed into any other single letter.

3. Algorithm to Transform Words:
- Given two words, we can lengthen the shorter word by adding equivalent letters until both words are of the same length.
- Once the words are of the same length, we can change the letters accordingly using the transformations described above.

Conclusion:
Since we have shown that any double letter can be transformed into any other double letter and any single letter can be transformed into any other single letter, it follows that all words in this language are synonymous.

$\blacksquare$