Not having heard the words spoken by him I can only suggest that maybe either he misspoke and got hung up using the wrong term, or he was misquoted.
As far as definitions go, homicide does not leave any ambiguity. There are other charges that contain the word homicide, such as vehicular homicide, but homicide in itself is not a crime. The crime would be the action that resulted in the homicide.
In the other thread, Baldwin, I link to the opinion article by Dershowitz. It is sloppy writing to his fan base. I know he knows the difference for I have heard him eloquently define it.