annoyance vs negative stimulus

annoyance and negative stimulus both are nouns.

Word	Noun	Adjective	Verb	Adverb
annoyance	Yes	No	No	No
negative stimulus	Yes	No	No	No

As nouns, negative stimulus is a hypernym of annoyance; that is, negative stimulus is a word with a broader meaning than annoyance:

annoyance: something or someone that causes trouble; a source of unhappiness
negative stimulus: a stimulus with undesirable consequences

annoyance (noun)	negative stimulus (noun)
the act of troubling or annoying someone	a stimulus with undesirable consequences
something or someone that causes trouble; a source of unhappiness
anger produced by some annoying irritation
an unpleasant person who is annoying or exasperating
the psychological state of being irritated or annoyed