太太 means wife, usually used by older couples.
老婆 means wife, usually used by younger couples, sometimes young people also use this term to describe their girlfriends even though they are not married which is thought to be a nice gesture.
爱人 means spouse, this word is almost only used by people from last generation
配偶 is the formal word for spouse
妻子 is the formal word for wife
内人 is old-fashioned, used by Chinese lived in the past.
hope it helps, pal.