run down vs act on

run down and act on both are verbs.

Word	Noun	Adjective	Verb	Adverb
run down	No	No	Yes	No
act on	No	No	Yes	No

As verbs, act on is a hypernym of run down; that is, act on is a word with a broader meaning than run down:

Other hypernyms of run down include follow up on, pursue.

run down (verb)	act on (verb)
use up all one's strength and energy and stop working	carry further or advance
injure or kill by knocking (someone or something) down and passing over the body, as with a vehicle	regulate one's behavior in accordance with certain information, ideas, or advice
pursue until captured
move downward
examine hastily
deplete
trace