climax vs climactic

climax is a noun but climactic is not a noun.

Word	Noun	Adjective	Verb	Adverb
climax	Yes	No	Yes	No
climactic	No	Yes	No	No

climax (noun)	climactic (noun)
the moment of most intense pleasure in sexual intercourse
the decisive moment in a novel or play
arrangement of clauses in ascending order of forcefulness
the highest point of anything conceived of as growing or developing or unfolding
the most severe stage of a disease

climax (adjective)	climactic (adjective)
	consisting of or causing a climax

climax (verb)	climactic (verb)
end, especially to reach a final or climactic stage