timber vs planking

timber and planking both are nouns.

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

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

Other hyponyms of timber include stock, strip, board, plank.

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