onus vs pill

onus and pill both are nouns.

Word	Noun	Adjective	Verb	Adverb
onus	Yes	No	No	No
pill	Yes	No	No	No

As nouns, pill is a hyponym of onus; that is, pill is a word with a more specific, narrower meaning than onus:

Other hyponyms of onus include dead weight, fardel, imposition.

onus (noun)	pill (noun)
an onerous or difficult concern	a dose of medicine in the form of a small pellet
	something that resembles a tablet of medicine in shape or size
	a contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception
	something unpleasant or offensive that must be tolerated or endured
	a unpleasant or tiresome person