Gynesexual or gynosexual is a term with several possible definitions.
First, is the attraction to women. This means that heterosexual men, lesbian women, and non-binary people attracted to women can be considered gynesexuals. Another word for this definition is womasexual.
Thirdly, is the attraction to "female anatomy" regardless of whether that person identifies as female, however this definition is sometimes considered transphobic, as it reduces people to their genitals.
This identity is sometimes referred to as "gynephilia" or "gynophilia," however those terms are outdated.
The term was possibly made with non-binary or genderqueer people in mind. However, many non-binary people prefer terms like finsexual, venusic, or womasexual to describe this attraction, because gynesexual has no agreed upon definition, which can make it's usage confusing, and it can have unfavorable connotations. The term gnyesexual is commonly used by transphobes as a reason to exclude trans women because they are only attracted to "female anatomy" or "real women". Under this definition, it reduces people to their genitalia, putting cis women and pre-surgery trans men in the same group because they have "female anatomy". The prefix gyne- means "woman" or "female," which may imply that one sees "female anatomy" and being a woman as interchangeable.