pallor vs pallidness

pallor and pallidness both are nouns.

Word	Noun	Adjective	Verb	Adverb
pallor	Yes	No	No	No
pallidness	Yes	No	No	No

As nouns, pallor and pallidness are synonyms defined as:

pallor and pallidness: unnatural lack of color in the skin (as from bruising or sickness or emotional distress)

Other synonyms of pallor include achromasia, lividity, lividness, luridness, paleness, wanness.

pallor (noun)	pallidness (noun)
unnatural lack of color in the skin (as from bruising or sickness or emotional distress)	unnatural lack of color in the skin (as from bruising or sickness or emotional distress)