teacake vs tea biscuit

teacake and tea biscuit both are nouns.

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

As nouns, teacake and tea biscuit are synonyms defined as:

teacake and tea biscuit: flat semisweet cookie or biscuit usually served with tea

teacake (noun)	tea biscuit (noun)
any of various small cakes or cookies often served with tea	flat semisweet cookie or biscuit usually served with tea
flat semisweet cookie or biscuit usually served with tea