cooking vs roasting

cooking and roasting both are nouns.

Word	Noun	Adjective	Verb	Adverb
cooking	Yes	No	No	No
roasting	Yes	No	No	No

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

cooking: the act of preparing something (as food) by the application of heat
roasting: cooking (meat) by dry heat in an oven (usually with fat added)

cooking (noun)	roasting (noun)
the act of preparing something (as food) by the application of heat	cooking (meat) by dry heat in an oven (usually with fat added)