Here are some options, depending on the context:
Neutral:
* Giant - The word "giant" can be used for both men and women.
* Colossus - This word is also gender-neutral.
Feminine:
* Giantess - This is the most common feminine form of "giant."
* Titaness - This is more associated with Greek mythology, but can also be used in a broader sense.
* Amazon - This refers to a strong, powerful woman, particularly in ancient Greek mythology.
* She-giant - This is a more informal and less common option.
Ultimately, the best option depends on the specific context and the desired tone.