canned food vs canned foods

canned food and canned foods both are nouns.

Word	Noun	Adjective	Verb	Adverb
canned food	Yes	No	No	No
canned foods	Yes	No	No	No

As nouns, canned food and canned foods are synonyms defined as:

Other synonyms of canned food include canned goods, tinned goods.

canned food (noun)	canned foods (noun)
food preserved by canning	food preserved by canning