normal vs perpendicular

normal and perpendicular both are nouns.

normal (noun)	perpendicular (noun)
something regarded as a normative example	a straight line at right angles to another line
	a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting
	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
	an extremely steep face

normal (adjective)	perpendicular (adjective)
conforming with or constituting a norm or standard or level or type or social norm; not abnormal	intersecting at or forming right angles
in accordance with scientific laws	at right angles to the plane of the horizon or a base line
being approximately average or within certain limits in e.g. intelligence and development	so steep as to be nearly vertical
forming a right angle