ring of color vs sexual activity

ring of color and sexual activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
ring of color	Yes	No	No	No
sexual activity	Yes	No	No	No

ring of color (noun)	sexual activity (noun)
small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite	activities associated with sexual intercourse