Holy Sacrament vs Lord's Supper

Holy Sacrament and Lord's Supper both are nouns.

Word	Noun	Adjective	Verb	Adverb
Holy Sacrament	Yes	No	No	No
Lord's Supper	Yes	No	No	No

As nouns, Holy Sacrament and Lord's Supper are synonyms defined as:

Holy Sacrament and Lord's Supper: a Christian sacrament commemorating the Last Supper by consecrating bread and wine

Other synonyms of Holy Sacrament include Eucharist, Eucharistic liturgy, Holy Eucharist, Liturgy, sacrament of the Eucharist.

Holy Sacrament (noun)	Lord's Supper (noun)
a Christian sacrament commemorating the Last Supper by consecrating bread and wine	a Christian sacrament commemorating the Last Supper by consecrating bread and wine
	the traditional Passover supper of Jesus with his disciples on the eve of his crucifixion