ADJ 女同性恋的 Lesbian is used to describe homosexual women.
Many of her best friends were lesbian. 她最要好的朋友中有很多都是女同性恋者。
A lesbian is a woman who is lesbian. 女同性恋者
...a youth group for lesbians, gays and bisexuals. 女同性恋者、男同性恋者和双性恋者都可参加的青年团体
ADJ 有关女同性恋者的 Lesbian is used to describe the relationships and activities of homosexual women, and the organizations or publications intended for them or created by them.
Her brother is homosexual. 她兄弟是同性恋。 She used three chapters to discuss the essence of the homosexual relationship in her paper. 她在论文中用了3章的篇幅探讨同恋性关系的实质。