tea biscuit vs cookie

tea biscuit and cookie both are nouns.

Word	Noun	Adjective	Verb	Adverb
tea biscuit	Yes	No	No	No
cookie	Yes	No	No	No

As nouns, cookie is a hypernym of tea biscuit; that is, cookie is a word with a broader meaning than tea biscuit:

Other hypernyms of tea biscuit include biscuit, cooky.

tea biscuit (noun)	cookie (noun)
flat semisweet cookie or biscuit usually served with tea	a short line of text that a web site puts on your computer's hard drive when you access the web site
	any of various small flat sweet cakes
	the cook on a ranch or at a camp