perpendicularity vs perpendicular

perpendicularity and perpendicular both are nouns.

Word	Noun	Adjective	Verb	Adverb
perpendicularity	Yes	No	No	No
perpendicular	Yes	Yes	No	No

perpendicularity (noun)	perpendicular (noun)
the quality of being at right angles to a given line or plane (especially the plane of the horizon)	an extremely steep face
the relation of opposition between things at right angles	a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point
	a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting
	a straight line at right angles to another line

perpendicularity (adjective)	perpendicular (adjective)
	intersecting at or forming right angles
	at right angles to the plane of the horizon or a base line
	so steep as to be nearly vertical