Continuing the discussion from Questions about weather vocab in Peace Corps manual:
Yes, it’s the same word. The recommended spelling these days is cɔɔcɔɔ but you may encounter cɔcɔ as well.
I think that the definition “heavy rain” is a a translation mix-up.
According to Dumestre’s dictionary, cɔcɔ/cɔɔcɔɔ refers to a “small fine and persistent rain; the drizzle of the month of August”.
In Koné’s monolingual dictionary, he describes it as such:
sanji bɛ bala ka na k’à sɔrɔ san ma fin
“rain [that] comes suddenly despite the sky not having darkened”
Basically, it designates a specific kind of seasonal rain/drizzle in the West African context. Not necessarily a good one-to-one with “drizzle” in the way that people might understand it a a general term for light rain in the US, for instance.