Some freedom fighters may also be terrorists, but some terrorists are not freedom fighters.

In other words: while most national liberation movements resort to "terrorism" (i.e. the pursuit of political gain through violent intimidation) as a means towards their goal, there are many terrorist movements who do not seek freedom (other than the "freedom" to do as they like).

For example, were Nazi SA men, during the 1920s-30s, "freedom fighters"? Were the Al-Qaeda hijackers, who crashed into TWC? Also, were PLO guerrilas (after showing the world that a free and independant state sits lower on their priority list than blowing up a bus full of Israeli civilians)?