The phrase "object of one's affection" is a common way to describe someone that a person cares deeply about or is in love with. However, there are many synonyms that can be used to express this sentiment. Some of the most common include "beloved," "darling," "sweetheart," "paramour," "lover," "crush," "flame," "adored one," "significant other," and "soulmate." Each of these words conveys a sense of love and admiration, making them great substitutes for "object of one's affection." Depending on the context and the relationship between the two individuals, one of these synonyms may be more appropriate than another.