inclined vs horizontal

inclined is not a noun while horizontal is a noun.

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

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

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