sweetheart
sweet-heart
noun
A very kind, pleasant, or likeable person.
"He's an absolute sweetheart, always so thoughtful."
noun
A person one loves, or an affectionate term of address.
"Hello, sweetheart, how was your day?"
Thesaurus
Synonyms: privileged, honey, beloved, love, sweetie, darling, dear, baby, dearest, deary, dearie, dish