spectral vs spiritual

spectral is not a noun while spiritual is a noun.

Word	Noun	Adjective	Verb	Adverb
spectral	No	Yes	No	No
spiritual	Yes	Yes	No	No

As adjectives, spectral and spiritual are synonyms defined as:

Other synonyms of spectral include apparitional, ghostlike, ghostly, phantasmal.

spectral (noun)	spiritual (noun)
	a kind of religious song originated by Blacks in the southern United States

spectral (adjective)	spiritual (adjective)
of or relating to a spectrum	lacking material body or form or substance
resembling or characteristic of a phantom	concerned with sacred matters or religion or the church
	resembling or characteristic of a phantom
	concerned with or affecting the spirit or soul