K ration vs field ration

K ration and field ration both are nouns.

Word	Noun	Adjective	Verb	Adverb
K ration	Yes	No	No	No
field ration	Yes	No	No	No

As nouns, field ration is a hypernym of K ration; that is, field ration is a word with a broader meaning than K ration:

K ration: a small package of emergency rations; issued to United States troops in World War II
field ration: rations issued for United States troops in the field

K ration (noun)	field ration (noun)
a small package of emergency rations; issued to United States troops in World War II	rations issued for United States troops in the field