This is the 8038th most frequent Japanese word.
婦
"Wife" or "woman," often referring to a married woman.
In '主婦', '婦' suggests a lady or woman, specifically referring to a housewife in this term.
主婦は家事をする責任があります。
A housewife has responsibilities for household chores.
Here, '婦人' is used to mean 'woman' or 'lady', often politely referring to an adult woman.
婦人は家族にとって重要な存在です。
Women are an important presence for the family.
Within '産婦人科', '婦' contributes to the meaning, relating to women, particularly in medical contexts such as obstetrics.