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acordeonista (both genders)
A hermaphrodite has characteristics of both genders. Check the Greek origin of Hermes joining with Aphrodites.
A cecaelia refers to both genders, not sure a male or a female.
Bisexual - meaning liking both
A person who practices yoga is called a 'yogi'. Some call women who practice yoga, 'yogini', but 'yogi' can be used for both, much like the term 'actor' can be used for both genders as well.
A student is what you would call someone who is in college.
Yes - both genders can and do howl, as well as other vocalisations.
"Writer-director" is a common term for it.
vixen
A person that can write with both hands is ambidextrous.
Male pigs are called boars. Female pigs are called slows. Generally, most people call both genders of the animals just pigs.
Someone attracted to both genders is called a bisexual. Whether they like one gender more than the other or both equally.