strike down vs lumber

strike down is not a noun while lumber is a noun.

Word	Noun	Adjective	Verb	Adverb
strike down	No	No	Yes	No
lumber	Yes	No	Yes	No

As verbs, lumber is a hyponym of strike down; that is, lumber is a word with a more specific, narrower meaning than strike down:

Other hyponyms of strike down include chop down, poleax, poleaxe, log, cut.

strike down (noun)	lumber (noun)
	an implement used in baseball by the batter
	the wood of trees cut and prepared for use as building material

strike down (verb)	lumber (verb)
cause to fall by or as if by delivering a blow	cut lumber, as in woods and forests
cause to die, especially suddenly	move heavily or clumsily
declare null and void; make ineffective