chest vs coffer

chest and coffer both are nouns.

Word	Noun	Adjective	Verb	Adverb
chest	Yes	No	No	No
coffer	Yes	No	No	No

As nouns, coffer is a hyponym of chest; that is, coffer is a word with a more specific, narrower meaning than chest:

chest (noun)	coffer (noun)
box with a lid; used for storage; usually large and sturdy	a chest especially for storing valuables
furniture with drawers for keeping clothes	an ornamental sunken panel in a ceiling or dome
the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates
the front of the trunk from the neck to the abdomen