slanderous vs calumniatory

slanderous and calumniatory both are adjectives.

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

As adjectives, slanderous and calumniatory are synonyms defined as:

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

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

slanderous (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