I I understand your intention behind "word suite", I think you want to know the difference between this group of three related words, fit, adjust and adapt. Your usage of the term "word suite" is confusing to native English speakers as it is not something we would say or read.
fit = works effectively and efficiently in the given situation; to physically match and work as intended
adapt = to voluntarily change the shape, working style or method of something (or someone) in order to fit the current environment or situation; usually, but not always, requires a significant
adjust = to physically, emotionally or mentally make changes in order to fit into the current situation.
Adapt and adjust have similarities in usage. Fit is the result of adapting or adjusting.
"I found myself not fitting into my new workplace. As a result, I had to adjust the way that I verbally communicated with my colleagues as well as the way that I managed my projects. After making these adjustments, my boss felt that I was adapting well to my new workplace. Now, I fit right in with my colleagues."
Finally, the answer to this question is much more complex than what I have written as there are many differences in usuage between adapt and adjust as well as many definitions of fit. I have just explained the most common.