communicant

Short definition from Wiktionary

Noun

1. 1
   A person who receives (or is allowed to receive) the elements (i.e., bread and wine) of the sacrament of Holy Communion. (Compare also these terms: communion, Communion, Lord's Supper, Mass, Eucharist, Divine Liturgy.)
2. 2
   One who communicates.

Adjective

1. 1
   Communicating.