A husband and wife are doing a crossword puzzle.

Husband: Programs for mobile devices. 4 letters

Wife: Apps

Husband: Adolescent, 4 letters

Wife: Teen

Husband: Contraction meaning failed to perform, 5 letters

Wife: Didn't

Husband: Take a life, 4 letters

Wife: Kill

Husband: Religious songs, 5 letters

Wife: Hymns

Husband: Santa's little helper, 3 letters

Wife: Elf