areola vs ring of color

areola and ring of color both are nouns.

Word	Noun	Adjective	Verb	Adverb
areola	Yes	No	No	No
ring of color	Yes	No	No	No

As nouns, areola and ring of color are synonyms defined as:

areola and ring of color: small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite

areola (noun)	ring of color (noun)
small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite	small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite
small space in a tissue or body part such as the area between veins on a leaf or an insect's wing