The word Swetheart is misspelled against Sweetheart, a noun meaning "A lover of mistress."
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Sweetheart has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings Sw & theart which should not be misspelled with single 'E'
Wrong Spelling:  Sw-e-theart 
Correct Spelling:  Sw-ee-theart 
Explore spell check of Sweetheart to spell without errors.