altar vs communion table

altar and communion table both are nouns.

Word	Noun	Adjective	Verb	Adverb
altar	Yes	No	No	No
communion table	Yes	No	No	No

As nouns, altar and communion table are synonyms defined as:

altar and communion table: the table in Christian churches where communion is given

Other synonyms of altar include Lord's table.

altar (noun)	communion table (noun)
a raised structure on which gifts or sacrifices to a god are made	the table in Christian churches where communion is given
the table in Christian churches where communion is given