There are many words that can be used as synonyms for "romantic interest." Some options include "paramour," "sweetheart," "beloved," "beau," "significant other," "lover," "flame," "crush," "darling," "dear," "squeeze," and "partner." Each of these words conveys a sense of affection and attraction to another person. The choice of which word to use may depend on the context and the relationship between the two individuals involved. Whether you're talking about a budding romance or a long-term partnership, there are plenty of alternatives to "romantic interest" that can add nuance and depth to your language.