I understand the difference between kerning and tracking, but is there a term for the space between words. For example, I have a document in which the spacing in the line of text is so tight, that it is difficult to read. So, I'd like to increase the space between words for legibility.
It is actually called "tracking" in proper Typography terminology, and "word spacing" for the rest of the world : ). If you tighten it up, words start to jumble on top of each other. Loosen it too much, and you might end up with a text which is difficult to read. What tracking does is modify the sidebearings of all letters in a given text. Sidebearings are the blank space to both the left and right of every glyph in a given font, and it is normally defined by the type designer.