lie-abed vs slugabed

lie-abed and slugabed both are nouns.

Word	Noun	Adjective	Verb	Adverb
lie-abed	Yes	No	No	No
slugabed	Yes	No	No	No

As nouns, lie-abed and slugabed are synonyms defined as:

lie-abed and slugabed: a person who stays in bed until a relatively late hour

lie-abed (noun)	slugabed (noun)
a person who stays in bed until a relatively late hour	a person who stays in bed until a relatively late hour