When it comes to expressing excessive care, there are a few synonyms that could be utilized instead of "lavish care on." The term "pamper" can be used to denote excessive care, especially in relation to indulging someone's desires. "Spoil" can also be employed as a synonym for lavish care, but with a slightly negative connotation, as it often refers to indulging with excessive favor. Another synonym could be "coddle," which implies treating someone in a sensitive way or giving into their idiosyncrasies. Love and nurture could be used as well, both expressing care or attention that is extensive and genuine, albeit slightly less indulgent than "lavish care".