packing box vs stuffing box

packing box and stuffing box both are nouns.

Word	Noun	Adjective	Verb	Adverb
packing box	Yes	No	No	No
stuffing box	Yes	No	No	No

As nouns, packing box and stuffing box are synonyms defined as:

packing box and stuffing box: a small chamber in which packing is compressed around a reciprocating shaft or piston to form a seal

packing box (noun)	stuffing box (noun)
a small chamber in which packing is compressed around a reciprocating shaft or piston to form a seal	a small chamber in which packing is compressed around a reciprocating shaft or piston to form a seal
a large crate in which goods are packed for shipment or storage