candour vs honesty

candour and honesty both are nouns.

Word	Noun	Adjective	Verb	Adverb
candour	Yes	No	No	No
honesty	Yes	No	No	No

As nouns, honesty is a hypernym of candour; that is, honesty is a word with a broader meaning than candour:

candour: the quality of being honest and straightforward in attitude and speech
honesty: the quality of being honest

Other hypernyms of candour include honestness.

candour (noun)	honesty (noun)
the quality of being honest and straightforward in attitude and speech	the quality of being honest
ability to make judgments free from discrimination or dishonesty	southeastern European plant cultivated for its fragrant purplish flowers and round flat papery silver-white seedpods that are used for indoor decoration