limn
ague
Ache is a synonym for empathize.
Work is a synonym for task.
A-one, Tops.
idea, heed, or view
myth
Pots, cuts, raps, rips
Sly or crafty (for two). Sharp, cunning, intelligent. (For three more)
Armor is a 5-letter word starting with A that means "mail," as in chain mail armor worn by medieval knights.
F is also the first letter of the synonym "faux" (meaning false or imitation). M is the first letter of the word "mock" (same connotation as faux).
A synonym for fable (4 letters, beginning with M) is myth.
Ruin is a synonym for wreck. It is a 4 letter verb.