blind spot vs topic

blind spot and topic both are nouns.

Word	Noun	Adjective	Verb	Adverb
blind spot	Yes	No	No	No
topic	Yes	No	No	No

As nouns, topic is a hypernym of blind spot; that is, topic is a word with a broader meaning than blind spot:

blind spot: a subject about which you are ignorant or prejudiced and fail to exercise good judgment
topic: some situation or event that is thought about

Other hypernyms of blind spot include issue, matter, subject.

blind spot (noun)	topic (noun)
the point where the optic nerve enters the retina; not sensitive to light	some situation or event that is thought about
a subject about which you are ignorant or prejudiced and fail to exercise good judgment	the subject matter of a conversation or discussion