remember vs brush up

remember and brush up both are verbs.

Word	Noun	Adjective	Verb	Adverb
remember	No	No	Yes	No
brush up	No	No	Yes	No

As verbs, brush up is a hyponym of remember; that is, brush up is a word with a more specific, narrower meaning than remember:

Other hyponyms of remember include know, recognise, recognize, refresh, review.

remember (verb)	brush up (verb)
recall knowledge from memory; have a recollection	bring to a highly developed, finished, or refined state
keep in mind for attention or consideration	refresh one's memory
recapture the past; indulge in memories
exercise, or have the power of, memory
call to remembrance; keep alive the memory of someone or something, as in a ceremony
mention as by way of greeting or to indicate friendship
mention favorably, as in prayer
show appreciation to