sternpost vs timber

sternpost and timber both are nouns.

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

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

sternpost (noun)	timber (noun)
(nautical) the principal upright timber at the stern of a vessel	a beam made of wood
	a post made of wood
	(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