planking vs timber

planking and timber both are nouns.

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

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

Other hypernyms of planking include lumber.

planking (noun)	timber (noun)
the work of covering an area with planks	a beam made of wood
(nautical) a covering or flooring constructed of planks (as on a ship)	a post made of wood
planks collectively; a quantity of planks	(music) the distinctive property of a complex sound (a voice or noise or musical sound)
	land that is covered with trees and shrubs
	the wood of trees cut and prepared for use as building material