doughnut-shaped vs ringed

doughnut-shaped and ringed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
doughnut-shaped	No	Yes	No	No
ringed	No	Yes	No	No

As adjectives, doughnut-shaped and ringed are synonyms defined as:

Other synonyms of doughnut-shaped include annular, annulate, annulated, circinate, ring-shaped.

doughnut-shaped (adjective)	ringed (adjective)
shaped like a ring	wearing a wedding ring; lawfully married
	having colored rings around the body
	shaped like a ring