vesper vs placebo

vesper and placebo both are nouns.

Word	Noun	Adjective	Verb	Adverb
vesper	Yes	No	No	No
placebo	Yes	No	No	No

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

vesper (noun)	placebo (noun)
a late afternoon or evening worship service	(Roman Catholic Church) vespers of the office for the dead
	an innocuous or inert medication; given as a pacifier or to the control group in experiments on the efficacy of a drug