defamatory vs calumniatory

defamatory and calumniatory both are adjectives.

Word	Noun	Adjective	Verb	Adverb
defamatory	No	Yes	No	No
calumniatory	No	Yes	No	No

As adjectives, defamatory and calumniatory are synonyms defined as:

defamatory and calumniatory: (used of statements) harmful and often untrue; tending to discredit or malign

Other synonyms of defamatory include calumnious, denigrating, denigrative, denigratory, libellous, libelous, slanderous.

defamatory (adjective)	calumniatory (adjective)
(used of statements) harmful and often untrue; tending to discredit or malign	(used of statements) harmful and often untrue; tending to discredit or malign