talking vs cant

talking and cant both are nouns.

Word	Noun	Adjective	Verb	Adverb
talking	Yes	No	No	No
cant	Yes	No	Yes	No

As nouns, cant is a hyponym of talking; that is, cant is a word with a more specific, narrower meaning than talking:

talking (noun)	cant (noun)
an exchange of ideas via conversation	two surfaces meeting at an angle different from 90 degrees
	a characteristic language of a particular group (as among thieves)
	stock phrases that have become nonsense through endless repetition
	insincere talk about religion or morals
	a slope in the turn of a road or track; the outside is higher than the inside in order to reduce the effects of centrifugal force

talking (verb)	cant (verb)
	heel over