calumniatory vs libellous

calumniatory and libellous both are adjectives.

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

As adjectives, calumniatory and libellous are synonyms defined as:

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

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

calumniatory (adjective)	libellous (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