Holy Eucharist vs sacrament of the Eucharist

Holy Eucharist and sacrament of the Eucharist both are nouns.

Word	Noun	Adjective	Verb	Adverb
Holy Eucharist	Yes	No	No	No
sacrament of the Eucharist	Yes	No	No	No

As nouns, Holy Eucharist and sacrament of the Eucharist are synonyms defined as:

Holy Eucharist and sacrament of the Eucharist: a Christian sacrament commemorating the Last Supper by consecrating bread and wine

Other synonyms of Holy Eucharist include Eucharist, Eucharistic liturgy, Holy Sacrament, Liturgy, Lord's Supper.

Holy Eucharist (noun)	sacrament of the Eucharist (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