Certitude vs Certainity - What's the difference?

As nouns the difference between certitude and certainity

is that certitude is (uncountable) sureness, certainty while certainity is .

(Certainty)

(en noun)

(uncountable) Sureness, certainty.

I have absolute certitude about that.

(countable) Something that is a certainty.

Taxes are obviously certitudes .

* (l) (more common)

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(head)