not him, but a warlock is in league with the devil as is they've made a deal for power.
It also means "oathbreaker" after all what type of a so-and-so makes deals with the devil.
in fact it used to mean "devil" full stop.
a witch is just a sort of herbal wizard not good, not evil, just you know,
"here's some wort to heal your wounds"
"but not you! you get the evil eye!"
sort of thing. not to be confused with a "hag" which is a evil spirit
but Christianity painted them as evil because well in medieval England anything that isn't Christian was the work of the devil.
To stick with the analogy I'd say it's more like the difference between being a "homosexual" and being a "raging faggot"