hatred, dislike, or mistrust of women.
1. attitudes or behavior based on traditional stereotypes of sexual roles.
2. discrimination or devaluation based on a person's sex, as in restricted job opportunities; esp., such discrimination directed against women.
I was in a discussion at girl-wonder where the art of Rob Liefeld and Greg Land was described as misogynistic. I disagreed and said it was sexist but not actually misogynistic. Rather than sidetrack that discussion I thought I'd address the difference here.
Misogyny is hatred. A writer or artist might claim to be pro-women and even give female characters overtly empowered roles, but when those characters are forced to suffer in degrading ways that their male counterparts do not, then misogynism is apparent in the work. When women are made to suffer or die purely as a way of motivating a male character it's misogynism.
I know it's a favourite example of mine, but Kimiyo Hoshi's treatment in Green Arrow is misogynistic, pure and simple. I don't care how feminist Judd Winick thinks he is, or how empowered his female characters are in other comics, the way Kimiyo is treated is entirely misogynistic. She is attacked and beaten, symbolically raped, and left badly injured. The hero finds her and is motivated by her plight (though not enough to tend to her injuries before he chases off after the villain), and having served her purpose she is dropped from the comic, her personal story unresolved.
Sexism is more about assumptions. It's about assuming women having a lower value than men in any given situation. It's objectifying. It's making decisions based on sex rather than any relevent data. It is not about hate. Rob Liefeld doesn't hate women. He likes women. He likes drawing hot women in skimpy clothing. His art exaggerates all the hotness to a level where they appear absurdly deformed, but although it is a level of objectivism beyond stupid, it's not hate.
That's what I think, anyway.