I am trying to help with your question not to go down your forbidden path. I took the liberty to collect the definitions of the words involved. Perhaps the names are being used interchangeably when they are not. A rose by any other name smells the same.

Terrorist
1. A person, usually a member of a group, who uses or advocates terrorism
2. Of, pertaining to, or characteristic of terrorism or terrorists.
3. One that engages in acts or an act of terrorism.
4. A person who tries to frighten people or governments into doing what he/she wants by using or threatening violence.

Terrorism
1. The use of violence and threats to intimidate or coerce, esp. for political purposes.
2. A terroristic method of governing or of resisting a government.
3. The unlawful use or threatened use of force or violence by a person or an organized group against people or property with the intention of intimidating or coercing societies or governments, often for ideological or political reasons.
4. The calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coercion or instilling fear.

Freedom Fighter
1. A fighter for freedom, esp. a person who battles against established forces of tyranny and dictatorship.
2. One engaged in armed rebellion or resistance against an oppressive government.
3. A person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)

Resistance
1. The act or power of resisting, opposing, or withstanding.
2. Often Resistance An underground organization engaged in a struggle for national liberation in a country under military or totalitarian occupation.
3. group action in opposition to those in power