areola vs knocker

areola and knocker both are nouns.

Word	Noun	Adjective	Verb	Adverb
areola	Yes	No	No	No
knocker	Yes	No	No	No

areola (noun)	knocker (noun)
small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite	a device (usually metal and ornamental) attached by a hinge to a door
small space in a tissue or body part such as the area between veins on a leaf or an insect's wing	either of two soft fleshy milk-secreting glandular organs on the chest of a woman
	one who disparages or belittles the worth of something
	a person who knocks (as seeking to gain admittance)
	(Yiddish) a big shot who knows it and acts that way; a boastful immoderate person