food chain vs food cycle

food chain and food cycle both are nouns.

Word	Noun	Adjective	Verb	Adverb
food chain	Yes	No	No	No
food cycle	Yes	No	No	No

food chain (noun)	food cycle (noun)
(ecology) a community of organisms where each member is eaten in turn by another member	(ecology) a community of organisms where there are several interrelated food chains