stocking vs supplying

stocking and supplying both are nouns.

Word	Noun	Adjective	Verb	Adverb
stocking	Yes	No	No	No
supplying	Yes	No	No	No

As nouns, supplying is a hypernym of stocking; that is, supplying is a word with a broader meaning than stocking:

Other hypernyms of stocking include provision, supply.

stocking (noun)	supplying (noun)
the activity of supplying a stock of something	the activity of supplying or providing something
close-fitting hosiery to cover the foot and leg; come in matched pairs (usually used in the plural)