slugabed vs lie-abed

slugabed and lie-abed both are nouns.

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

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

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

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