Text coordinates works in terms of natural language units such as words and phrases.
The dimensions available in text coordinates are as follows:
Navigating by words is slightly different from the emacs forward-word command (see Words (emacs)): it always leaves the cursor on the first character of a word.
Navigating by phrases uses the variable phrase-end to define
the end of a phrase.
The other dimensions in this group are based closely on the underlying Emacs facilities. See Sentences (The GNUemacs manual), and See Paragraphs (The GNUemacs manual).