discus vs disk

discus and disk both are nouns.

Word	Noun	Adjective	Verb	Adverb
discus	Yes	No	No	No
disk	Yes	No	Yes	No

As nouns, disk is a hypernym of discus; that is, disk is a word with a broader meaning than discus:

Other hypernyms of discus include disc, sports equipment.

discus (noun)	disk (noun)
a disk used in throwing competitions	a flat circular plate
an athletic competition in which a disk-shaped object is thrown as far as possible	sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove
	(computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored
	something with a round shape resembling a flat circular plate

discus (verb)	disk (verb)
	draw a harrow over (land)