Transsexual
Transgender
Trans woman
Trans girl
these are mostly fine to use in real life
Girl(male)
Dickgirl
Brat in need of rape correction
fine to use on Anon Babble if you don't mind people thinking you're a chaser
Tranny
Troon
don't use these if you aren't trans
Ladyboy
don't use this unless you're thai or hiring prostitutes in thailand
Hegirl
Shemale
don't use these, period.
Transvestite
Crossdresser
Sissy
Gender nonconforming
these refer to different groups of people, don't use them to refer to trans women. the exception is "gender nonconforming" which you can accurately use to refer to, like, a trans butch lesbian.
Transwoman
Transgirl
these are both weak evidence the speaker is a terf, and moderate evidence the speaker isn't particularly familiar with trans people. this form is commonly used and by itself isn't going to piss most people off, but the form with the space is usually preferred.
the literal meaning of "transsexual" is fine but it's also an exosemantic gang sign for one side of a dispute within the trans community. you may step into a conflict you don't understand and don't want any part of if you use it.