One term

If all gender variance were to be summarized as 'trans' then we have a problem because if the behavior being described is too varied it ostensibly renders the term meaningless. From enjoying women's underwear, to occasional dressing up, to full medical transition you cannot have one truncated term describe it all when the end results and impacts on individual lives can be so different. 

Not to mention that the amount of help and intervention required for each person varies substantially. 

In that case, a better suited and more inclusive term might simply be 'human'.