Sweetheart soap was once a bar soap made by the New York soap company I believe. It was packaged in neat little drawer style boxes and had a rather elegant filigree design embossed around the bar edges. The fragrance was a delightful rose floral and the creamy soap produced a lovely lather. It is no longer available as far as I can determine. Dial also made a liquid soap that it called Sweetheart but I doubt that it was (is?) anything like the original bar soap. Several other soaps are called 'Sweetheart' but they are either heart shaped or intended as gift soaps and, again, are not the same as the original.
The Vermont Country Store used to have it. It's an online & catalog store. When I checked Vermont Country Store on 2/21/09, it no longer carries Sweetheart Soap.
The word "sweetheart" can function as both a noun and an adjective. As a noun, it refers to a person who is loved or cherished, while as an adjective, it describes someone or something endearing or affectionate.
A sweetheart who is hilaris
Harlequins sweetheart
My Sweetheart was created in 1918.
sweetheart
Lover is a synonym for sweetheart.
My Chemical Romance sand the song Sweetheart.
No. Sweetheart is a noun. Verbs are actions.
Someday Sweetheart was created in 1919.
Tijuana Sweetheart was created in 2005.
She's a Sweetheart was created in 1944.