ring-shaped vs doughnut-shaped

ring-shaped and doughnut-shaped both are adjectives.

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

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

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

ring-shaped (adjective)	doughnut-shaped (adjective)
shaped like a ring	shaped like a ring