chest vs toy box

chest and toy box both are nouns.

Word	Noun	Adjective	Verb	Adverb
chest	Yes	No	No	No
toy box	Yes	No	No	No

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

chest (noun)	toy box (noun)
box with a lid; used for storage; usually large and sturdy	chest for storage of toys
furniture with drawers for keeping clothes
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