wrapper vs envelope

wrapper and envelope both are nouns.

Word	Noun	Adjective	Verb	Adverb
wrapper	Yes	No	No	No
envelope	Yes	No	No	No

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

wrapper: the covering (usually paper or cellophane) in which something is wrapped
envelope: any wrapper or covering

Other hyponyms of wrapper include film, plastic film, gift wrapping, jacket, plastic wrap.

wrapper (noun)	envelope (noun)
cloak that is folded or wrapped around a person	any wrapper or covering
a loose dressing gown for women	a flat (usually rectangular) container for a letter, thin package, etc.
the covering (usually paper or cellophane) in which something is wrapped	the bag containing the gas in a balloon
	the maximum operating capability of a system (especially an aircraft)
	a natural covering (as by a fluid)
	a curve that is tangent to each of a family of curves