sweetie vs ladylove

sweetie and ladylove both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweetie	Yes	No	No	No
ladylove	Yes	No	No	No

As nouns, ladylove is a hyponym of sweetie; that is, ladylove is a word with a more specific, narrower meaning than sweetie:

Other hyponyms of sweetie include dulcinea, sugar daddy, valentine.

sweetie (noun)	ladylove (noun)
a person loved by another person	a woman who is a man's sweetheart
a beloved person; used as terms of endearment