Usually if we use rate as a verb, it means to assess something's rating or level: 評價.
Rating is a noun, meaning 評級.
( but careful - if you said, "I am rating" it would mean 我正在評價 ! )
"rate" has different meanings. chinese is much more precise than english. in english, words have different meanings depending on the context.
等級 = rating (or maybe rate!)
率 = rate
速度 = speed (or rate!)