noting: (verb, present participle of to note) taking note of; paying attention to; noticing; mentioning to someone else
Part of the expression “also worth noting”.
nothing: (pronoun) not a thing; not anything; something of no value
(can also be used as an adjective and adverb)
NOT part of the expression “also worth noting” and in fact would mean the opposite.
Something worth noting is not worth nothing.