For/In favor of:
* Pro- (προ-): This is the Greek prefix meaning "for", "before", or "in front of". It's used in many words like "prologue", "protagonist", "propose", etc.
* Hypér (ὑπέρ): This means "over", "above", or "in defense of". It's used in words like "hypercritical", "hyperbole", and "hypertension".
* Eu (εὖ): This means "well", "good", or "favorable". It's used in words like "eulogy", "euphoria", and "euphemism".
Advocate/Support:
* Katalēgos (κατάλογος): Meaning "a listing" or "a catalog", but can be used to refer to a speaker or advocate for a cause.
* Apokritos (ἀπόκριτος): This means "a respondent" or "an advocate".
Proponent/Follower:
* Hēgemon (ἡγεμών): Meaning "leader" or "guide", used for someone who leads or supports a particular idea or movement.
* Phronimos (φρόνιμος): This means "wise", "intelligent", and can also imply someone who supports sound judgement or wisdom.
Important note:
* While these Greek words might not be exact translations of "pro", they capture some of the nuances and can be used in various contexts.
* It's best to consider the specific context and meaning you wish to convey when choosing a Greek word.
Let me know if you have a specific use case in mind, and I can help you find a more suitable Greek term.