perpendicular vs upright

perpendicular and upright both are nouns.

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

perpendicular (noun)	upright (noun)
an extremely steep face	a piano with a vertical sounding board
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 vertical structural member as a post or stake
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

perpendicular (adjective)	upright (adjective)
intersecting at or forming right angles	upright in position or posture
at right angles to the plane of the horizon or a base line	of moral excellence
so steep as to be nearly vertical	in a vertical position; not sloping