Here are some of the words and acronyms that are commonly used in American English for LGBT issues.
LGBT, LGBTQ, LGBTQA, TBLG: These acronyms refer to Lesbian, Gay, Bisexual, Transgender, Queer or Questioning, and Asexual or Ally. Although all of the different identities within “LGBT” are often lumped together (and share sexism as a common root of oppression), there are specific needs and concerns related to each individual identity.
Asexual: A person who generally does not feel sexual attraction or desire to any group of people. Asexuality is not the same as celibacy.
Ally: Typically any non-LGBT person who supports and stands up for the rights of LGBT people, though LGBT people can be allies, such as a lesbian who is an ally to a transgender person.
Biphobia: Aversion toward bisexuality and bisexual people as a social group or as individuals. People of any sexual orientation can experience such feelings of aversion. Biphobia is a source of discrimination against bisexuals, and may be based on negative bisexual stereotypes or irrational fear.
Bisexual: A person who is attracted to both people of their own gender and another gender. Also called “bi”.
Cisgender: Types of gender identity where an individual's experience of their own gender matches the sex they were assigned at birth.
Coming Out: The process of acknowledging one’s sexual orientation and/or gender identity to other people. For most LGBT people this is a life-long process.
Gay: A person who is attracted primarily to members of the same sex. Although it can be used for any sex (e.g. gay man, gay woman, gay person), “lesbian” is sometimes the preferred term for women who are attracted to women