food cycle vs food web

food cycle and food web both are nouns.

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

As nouns, food cycle and food web are synonyms defined as:

food cycle and food web: (ecology) a community of organisms where there are several interrelated food chains

food cycle (noun)	food web (noun)
(ecology) a community of organisms where there are several interrelated food chains	(ecology) a community of organisms where there are several interrelated food chains