What is the difference between "せん" and "線"?

"せん" means "thousand" (N5), whereas "線" represents "line, string, ray" (N4).

Kanji Homophone Battle

Pronunciation Trap: "せん (sen)"

Same sound, completely different Kanji! Choose the right conceptual writing.

Kanji Option A

せん (sen)

N5 / CEFR

Kanji Option B

せん (sen)

N4 / CEFR

In Japanese, many words share the exact same pronunciation "せん (sen)" but are written with different Kanji, changing the meaning entirely.

せん (Level: N5): Translates to "thousand" and is used when Used for numbers in the thousands. For example, 一千.
線 (Level: N4): Maps to "line, string, ray" and carries the nuance of Can refer to a drawn line, a connection line.

Mixing these up can easily result in unnatural writing. Look at the bilingual context cards below to master the conceptual boundaries!

Bilingual Context for "せん"

この本は一せん円です。

This book costs one thousand yen.

Bilingual Context for "線"

この紙に線を引いてください。

Please draw a line on this paper.

Which Kanji perfectly fits this blank space?

Which Kanji perfectly fits the blank: "この本は一＿＿＿円です。" (Meaning: "This book costs one thousand yen.")

🎉 Correct Answer!

Correct! "せん" is used for "thousand" in the context: "This book costs one thousand yen.".