bolus vs pill

bolus and pill both are nouns.

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

As nouns, pill is a hypernym of bolus; that is, pill is a word with a broader meaning than bolus:

Other hypernyms of bolus include lozenge, tab, tablet.

bolus (noun)	pill (noun)
a large pill; used especially in veterinary medicine	a dose of medicine in the form of a small pellet
a small round soft mass (as of chewed food)	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