This is the 4982nd most frequent Japanese word.
純子
"純子" (Junko) is a Japanese feminine given name meaning "pure child."
Here, 純子 (Junko) serves as a proper noun and is used as a person's name.
純子は学校の先生です。
Junko is a school teacher.
In this sentence, 純子 is used as the name indicating possession, referring to Junko's room.
純子の部屋はとても綺麗です。
Junko's room is very clean.
The word 純子 is used as a direct object in this sentence, indicating the recipient of the action 'met.'