The antonym of cisgender is transgender or trans.
Cisgender is the opposite of transgender or trans and cisgender is preferred to terms like biological, genetic or real male or female.
Cisgender is the term that describes someone whose gender identity matches their sex that is assigned at birth.
Pangender is a gender identity which describes someone that identifies with multiple genders.
The pangender identity encompasses multiple genders and can be experienced simultaneously or fluidly.
People who are pangender may also identify with traditional binary genders "male and female" and non binary genders.
Pangender basically refers to a person that has a gender identity that is not limited to one gender and can encompass all genders at once.
A demiboy is a gender identity that is within the non binary spectrum where a person partially identifies as being male.
When someone is a demiboy is basically means that the person feels a connection to masculinity but not fully.
The person identifying as a demiboy may also identify with other genders or no gender at all.
Essentially the person may only partly identify as a boy or man, regardless of the persons assigned sex at bight.
A demiboy feels a partial connection to the male gender but not a full or complete connection.
Like a demigirl, a demiboy may identify this way regardless of their assigned gender.
A demigirl and demiboy fall under the trans umbrella.
Basically demiboy is a gender that is partially male, and partially another gender or genders.
Partially male, and partially nothing or non binary is also defined as a non binary.