miserable vs low-down

miserable is not a noun while low-down is a noun.

Word	Noun	Adjective	Verb	Adverb
miserable	No	Yes	No	No
low-down	Yes	Yes	No	No

As adjectives, miserable and low-down are synonyms defined as:

Other synonyms of miserable include abject, low, scummy, scurvy.

miserable (noun)	low-down (noun)
	slang terms for inside information

miserable (adjective)	low-down (adjective)
of the most contemptible kind	of the most contemptible kind
of very poor quality or condition	(of jazz) having the soulful feeling of early blues
contemptibly small in amount
characterized by physical misery
deserving or inciting pity
very unhappy; full of misery