This is the 9245th most frequent Polish word.
tom
"Tom" in Polish means "volume" (as in a book or series).
In this sentence, 'Tom' is used as a proper noun—a personal name.
Tom jest bardzo pracowity.
Tom is very hardworking.
Here, 'tom' is a common noun referring to a volume or part of a book or series.
Przeczytałem już pierwszy tom tej powieści.
I have already read the first volume of this novel.
In this context, 'tom' is also a common noun, again indicating a specific books' part.