noun
A person who advocates for the expansion of women's rights; a somewhat formal or historical term.
彼女は女権拡張論者として知られている。
She is known as a feminist.
More common modern loanword for 'feminist', while 女権拡張論者 is a native compound that can sound more formal or historical.
Compound of 女権 (women's rights), 拡張 (expansion), and 論者 (advocate/theorist).