knocker vs areola

knocker and areola both are nouns.

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

knocker (noun)	areola (noun)
a device (usually metal and ornamental) attached by a hinge to a door	small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite
either of two soft fleshy milk-secreting glandular organs on the chest of a woman	small space in a tissue or body part such as the area between veins on a leaf or an insect's wing
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