autotrophic vs autotroph

autotrophic is not a noun while autotroph is a noun.

Word	Noun	Adjective	Verb	Adverb
autotrophic	No	Yes	No	No
autotroph	Yes	No	No	No

autotrophic (noun)	autotroph (noun)
	plant capable of synthesizing its own food from simple organic substances

autotrophic (adjective)	autotroph (adjective)
of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis