annular vs doughnut-shaped

annular and doughnut-shaped both are adjectives.

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

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

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

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