Lord's table vs altar

Lord's table and altar both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lord's table	Yes	No	No	No
altar	Yes	No	No	No

As nouns, Lord's table and altar are synonyms defined as:

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

Other synonyms of Lord's table include communion table.

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