forbidding vs test ban

forbidding and test ban both are nouns.

Word	Noun	Adjective	Verb	Adverb
forbidding	Yes	Yes	No	No
test ban	Yes	No	No	No

As nouns, test ban is a hyponym of forbidding; that is, test ban is a word with a more specific, narrower meaning than forbidding:

forbidding: an official prohibition or edict against something
test ban: a ban on the testing of nuclear weapons that is mutually agreed to by countries that possess nuclear weapons

forbidding (noun)	test ban (noun)
an official prohibition or edict against something	a ban on the testing of nuclear weapons that is mutually agreed to by countries that possess nuclear weapons

forbidding (adjective)	test ban (adjective)
threatening or foreshadowing evil or tragic developments
harshly uninviting or formidable in manner or appearance