RATCHET

T --> E

TEACHER

As for duck and in bold: Duck is what you should do to avoid being hit by a RICOCHET. Bold is like this as opposed to ordinary text. My "next word"s are most often in bold to indicate that that's my answer. A word NOT BOLD is a comment meaning "this one's close but breaks one rule of another and so doesn't really qualify." In other words, it's close, but no cigar.