brain vs tabula rasa

brain and tabula rasa both are nouns.

Word	Noun	Adjective	Verb	Adverb
brain	Yes	No	Yes	No
tabula rasa	Yes	No	No	No

As nouns, tabula rasa is a hyponym of brain; that is, tabula rasa is a word with a more specific, narrower meaning than brain:

brain: that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason
tabula rasa: a young mind not yet affected by experience (according to John Locke)

Other hyponyms of brain include noddle, ego, unconscious, unconscious mind, subconscious, subconscious mind.

brain (noun)	tabula rasa (noun)
that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord	a young mind not yet affected by experience (according to John Locke)
mental ability	an opportunity to start over without prejudice
that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason
the brain of certain animals used as meat
someone who has exceptional intellectual ability and originality

brain (verb)	tabula rasa (verb)
hit on the head
kill by smashing someone's skull