The phrase "fuss over" can be replaced by a number of synonyms depending on the context. In situations where someone is being overly concerned or worried about something, phrases such as "agonize over," "fret about," or "obsess about" can be used. When someone is giving excessive attention or care to someone or something, words like "dote on," "pamper," or "overindulge" can be used. In situations where there is unnecessary commotion or activity, phrases such as "make a big deal about," "blow things out of proportion," or "exaggerate" can be used instead of "fuss over." Overall, there are a multitude of synonyms available to convey the same meaning as "fuss over".