doughnut vs sinker

doughnut and sinker both are nouns.

Word	Noun	Adjective	Verb	Adverb
doughnut	Yes	No	No	No
sinker	Yes	No	No	No

As nouns, doughnut and sinker are synonyms defined as:

Other synonyms of doughnut include donut.

doughnut (noun)	sinker (noun)
a small ring-shaped friedcake	a pitch that curves downward rapidly as it approaches the plate
a toroidal shape	a weight that sinks (as to hold nets or fishing lines under water)
	a small ring-shaped friedcake