low-spiritedness vs lowness

low-spiritedness and lowness both are nouns.

Word	Noun	Adjective	Verb	Adverb
low-spiritedness	Yes	No	No	No
lowness	Yes	No	No	No

As nouns, low-spiritedness and lowness are synonyms defined as:

Other synonyms of low-spiritedness include dejectedness, dispiritedness, downheartedness.

low-spiritedness (noun)	lowness (noun)
a feeling of low spirits	the quality of being low; lacking height
	a low or small degree of any quality (amount or force or temperature etc.)
	a feeling of low spirits
	a position of inferior status; low in station or rank or fortune or estimation