The shortened word Trans is used most often, as it covers a wider verity of gender expression.
https://www.apa.org/topics/lgbtq/transgender-people-gender-identity-gender-expression
Transgender is an umbrella terms for persons whose gender identity, gender expression or behavior does not conform to that typically associated with the sex to which they were assigned at birth.
Gender identity refers to a person’s internal sense of being male, female or something else; gender expression refers to the way a person communicates gender identity to others through behavior, clothing, hairstyles, voice or body characteristics. ”
While transgender is generally a good term to use, not everyone whose appearance or behavior is gender-nonconforming will identify as a transgender person. The ways that transgender people are talked about in popular culture, academia and science are constantly changing, particularly as individuals’ awareness, knowledge and openness about transgender people and their experiences grow.
Many identities fall under the transgender umbrella. The term transsexual refers to people whose gender identity is different from their assigned sex.
According to the American Psychological Association Style guide, the term “transsexual” is largely outdated, but some people identify with it; this term should be used only for an individual who specifically claims it.
Often, transsexual people alter or wish to alter their bodies through hormones, surgery, and other means to make their bodies as congruent as possible with their gender identities. This process of transition through medical intervention is often referred to as sex or gender reassignment, but more recently is also referred to as gender affirmation.
People who were assigned female, but identify and live as male and alter or wish to alter their bodies through medical intervention to more closely resemble their gender identity are known as transsexual men or transmen (also known as female-to-male or FTM). Conversely, people who were assigned male, but identify and live as female and alter or wish to alter their bodies through medical intervention to more closely resemble their gender identity are known as transsexual women or transwomen (also known as male-to-female or MTF). Some individuals who transition from one gender to another prefer to be referred to as a man or a woman, rather than as transgender.