Well witches are female and warlocks are male, although the term witches applies to the group as a whole.
The rules change somewhat depending on plot needs, but generally it appears the older you get, the more power you have. Then as you get older and older, the power fades and you lose it all. You then become Earthbound.
I don’t recall anything saying Samantha was immortal, just Endorra saying that, with witches the aging processes takes centuries. That said, no one says they die either. But it would seem they do die, it just takes centuries.
Uncle Arthur, Endorra and Maurice are all of equal power. Arthur and Endorra being siblings. Endorra will declare to Maurice, “You may frighten Samantha, but you certainly don’t frighten me.”
Samantha explains when she takes on another witch her own age. “I’d say zap for zap we’re evenly matched, sort of reduces us to the human level. How’d you like a punch in the nose.”
Samantha is often shown to defeat her more powerful witch opponents by using her head. Mercedes Cambridge, played a witch even Endorra wouldn’t tangle with, and Samantha uses her head not her power, which she knows she can’t beat her, and winds up winning.
Endorra does this to, as her and Maurice are evenly matched so she either says she will move back in with him or simply states, “If you don’t do XXX, I’ll make your life miserable and you KNOW I can”
Aunt Clara proves to be stronger than any of them. When Endorra and her hag friends try to force Clara to be Earthbound, Samantha is her defense counsel. Samantha says she can do it only if Darrin isn’t home. When Darrin comes home early, in the middle of the trial, Clara banishes Endorra and the other hags into thin air. Thus they can’t make her Earthbound.
While Samantha thinks it was luck, Clara declares it’s love and she still has it if something is important enough to her.
The writers were clever to use the device that one witch can’t undo another’s spells. Though it appears to be, that one witch CAN undo another’s curse IF they know the exact spell. Since each witch would use a different spell they, in effect, control the situation.
Many times Samantha can undo a spell if she finds out how the spell was cast.
When Samantha puts a spell on another witch, Darrin asks how she can do that, Samantha replies, “It’s tricky but I caught him off guard.”
This seems to be the reason why Endorra can catch Uncle Arthur. Yet it fails to explain if Endorra can limit Arthur and Serina’s power and even Samantha’s power, why can’t Samantha do the same to Tabitha to prevent her witchcraft. Which is a plot hole that creeps in every now and then.
Other supernatural creatures appear like ghosts, crones, elves and such and it seems the witches always outrank them with power.
If you watch the show from season 1 you can see the first two seasons are much different. Darrin doesn’t know Samantha is a witch when he marries her. This is a good move on the writers part.
They also establish that witches have limited powers. This is lost after the color episodes start. Samantha declares to Darrin, she can’t force anyone love anyone else, as witches simply don’t have that power. They also have a couple episodes where a mortal and their charms can stop a witch cold.
The first season especially explains that Samantha can have anything but what she wants is Darrin. What Darrin wants is a simple, suburban stay at home wife.
So Darrin doesn’t hate what she IS, he didn’t know what he was getting into. Samantha WANTS to be what Darrin wants. And the show is about the struggle they both have.
In one of the episodes where Darrin and Endorra are fighting she says, she tries to stay on neutral ground but sometimes you can try so hard to be everything to everyone that you wind up being nothing to no one.
And finally the show is about love. Darrin loves Samantha despite what she is. He just needs time to adjust. Samantha also show Darrin that despite the fact she can have anything it only Darrin that she wants.
When Samantha zaps up a fur coat out of thin air, Darrin’s hurt as he feels he can’t provide for her. And then he realizes he can’t give her anything she cant zap up for herself. Samantha responds by giving away the coat. The lady says “You can’t give away something so valuable.” Samantha says, “It’s easy when you have something that’s worth a lot more than that.” Of course meaning Darrin