"Gunman women" is a term that is not very commonly used. However, if you're looking for synonyms, here are a few you might find useful:
1. Female shooter - this is a straightforward and accurate way to describe a woman who is armed and dangerous.
2. Gun-toting woman - this phrase can add a bit of flair to a description of a woman carrying a firearm.
3. Armed woman - a more generic term, but still quite effective in conveying the fact that a woman is carrying a weapon.
4. Pistol-packin' mama - this is a more colloquial and informal phrase, but it can be a fun way to describe a tough and independent woman who is handy with a gun.
Regardless of the term you choose, it's important to remember that gender does not determine a person's ability or propensity for violence.