planking vs lumber

planking and lumber both are nouns.

Word	Noun	Adjective	Verb	Adverb
planking	Yes	No	No	No
lumber	Yes	No	Yes	No

As nouns, lumber is a hypernym of planking; that is, lumber is a word with a broader meaning than planking:

Other hypernyms of planking include timber.

planking (noun)	lumber (noun)
the work of covering an area with planks	an implement used in baseball by the batter
(nautical) a covering or flooring constructed of planks (as on a ship)	the wood of trees cut and prepared for use as building material
planks collectively; a quantity of planks

planking (verb)	lumber (verb)
	cut lumber, as in woods and forests
	move heavily or clumsily