seven

(heel) + (one/line radical)
★★★★★
2 strokes
PK
'4' and '7' are numbers that don't follow the usual pronunciation rules. When counting time or months, usually one uses the KUNs, but with 4 and 7 you use the ONs.

Onyomi

SHICHI

SHE CHEATS seven times.

Mnemonic

Let's call the 'one' radical a dirty needle, for reasons which shall become clear.

You can tell the difference between heel and seven with the following mnemonic:

Seven heels get pierced with ONE dirty needle.

Kunyomi

なな seven
★★★★★
なな*つ seven things
★★★★☆

Jukugo

七月(しちがつ)

July ★★★★★ KANAFP
(seven) + (moon) = 七月 (July )

七時(しちじ)

7 o'clock ★★★★★ FP
(seven) + (time) = 七時 (7 o'clock)

七千円(ななせんえん)

7,000 yen. ★★★★★
(seven) + (thousand) + (yen/circle) = 七千円 (7,000 yen.)

七日(なのか)

the seventh day of the month ★★★★☆ FP
(seven) + (sun, day) = 七日 (the seventh day of the month)

七面鳥(しちめんちょう)

turkey ☆☆☆☆☆
(seven) + (front surface / face) + (bird) = 七面鳥 (turkey )

Lookalikes

Meaning Hint Radical
seven ONE DIRTY NEEDLE

Seven heels get pierced with ONE DIRTY NEEDLE.