irritation vs red flag

irritation and red flag both are nouns.

Word	Noun	Adjective	Verb	Adverb
irritation	Yes	No	No	No
red flag	Yes	No	No	No

As nouns, red flag is a hyponym of irritation; that is, red flag is a word with a more specific, narrower meaning than irritation:

Other hyponyms of irritation include exasperation.

irritation (noun)	red flag (noun)
unfriendly behavior that causes anger or resentment	something that irritates or demands immediate action
the act of troubling or annoying someone	a flag that serves as a warning signal
an uncomfortable feeling of mental painfulness or distress	the emblem of socialist revolution
a sudden outburst of anger
the psychological state of being irritated or annoyed
the neural or electrical arousal of an organ or muscle or gland
(pathology) abnormal sensitivity to stimulation