doughnut-shaped vs annular

doughnut-shaped and annular both are adjectives.

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

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

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

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