horizontal vs inclined

horizontal is a noun but inclined is not a noun.

Word	Noun	Adjective	Verb	Adverb
horizontal	Yes	Yes	No	No
inclined	No	Yes	No	No

horizontal (noun)	inclined (noun)
something that is oriented horizontally

horizontal (adjective)	inclined (adjective)
parallel to or in the plane of the horizon or a base line	at an angle to the horizontal or vertical position
	(often followed by `to') having a preference, disposition, or tendency
	having made preparations