fresh fish vs cannon fodder

fresh fish and cannon fodder both are nouns.

Word	Noun	Adjective	Verb	Adverb
fresh fish	Yes	No	No	No
cannon fodder	Yes	No	No	No

As nouns, fresh fish and cannon fodder are synonyms defined as:

fresh fish and cannon fodder: soldiers who are regarded as expendable in the face of artillery fire

Other synonyms of fresh fish include fodder.

fresh fish (noun)	cannon fodder (noun)
soldiers who are regarded as expendable in the face of artillery fire	soldiers who are regarded as expendable in the face of artillery fire