donut vs sinker

donut and sinker both are nouns.

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

As nouns, donut and sinker are synonyms defined as:

Other synonyms of donut include doughnut.

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