calamitous vs fatal

calamitous and fatal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
calamitous	No	Yes	No	No
fatal	No	Yes	No	No

As adjectives, calamitous and fatal are synonyms defined as:

calamitous and fatal: (of events) having extremely unfortunate or dire consequences; bringing ruin

Other synonyms of calamitous include black, disastrous, fateful.

calamitous (adjective)	fatal (adjective)
(of events) having extremely unfortunate or dire consequences; bringing ruin	bringing death
	having momentous consequences; of decisive importance
	controlled or decreed by fate; predetermined
	(of events) having extremely unfortunate or dire consequences; bringing ruin