A 妻子 refers to a married woman or wife. It is the term used to address a female spouse in a marital relationship.
老公 (lǎogōng): This term refers to a husband or male spouse.
丈夫 (zhàngfū): Similar to 妻子, 丈夫 means husband. It specifically emphasizes the role of being a responsible and caring partner.
夫妻 (fūqī): This term represents both husband and wife together as a couple. It signifies their bond and commitment to each other in marriage.