This is the 144th most frequent Hebrew word.
כתב
"כתב" (ketav) in Hebrew means "writing" or "script."
The word 'כתבתי' (wrote) is a verb in past tense, indicating the action of writing performed by the speaker, using the root 'כתב' which pertains to writing.
אני כתבתי את המכתב למורה.
I wrote the letter to the teacher.
The word 'כתב' (handwriting) is used as a noun to refer to the style or clarity of someone's handwriting.
הכתב של התלמיד הזה מאוד ברור.
The handwriting of this student is very clear.
While this does not directly use the word 'כתב,' it contains 'לכתוב' (to write), a verb meaning the act of writing, showing another usage of the root 'כתב'.