envelopment vs packing

envelopment and packing both are nouns.

Word	Noun	Adjective	Verb	Adverb
envelopment	Yes	No	No	No
packing	Yes	No	No	No

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

Other hyponyms of envelopment include boxing, encasement, incasement.

envelopment (noun)	packing (noun)
the act of enclosing something inside something else	the enclosure of something in a package or box
	carrying something in a pack on the back
	any material used especially to protect something