Thoughts on homonyms

Thoughts on homonyms -- words that sound the same but mean something entirely different -- for PPC. And yes, I am anal retentive, and no, Alex D, don't read this it will just make you frustrated.

reign

1. Exercise of sovereign power, as by a monarch.
2. The period during which a monarch rules.
3. Dominance or widespread influence: the reign of reason.

rein

1. A long narrow leather strap attached to each end of the bit of a bridle and used by a rider or driver to control a horse or other animal. Often used in the plural.
2. A means of restraint, check, or guidance.
3. A means or an instrument by which power is exercised. Often used in the plural: the reins of government.

rain

1. Water condensed from atmospheric vapor and falling in drops.
1. A fall of such water; a rainstorm.
2. The descent of such water.
3. Rainy weather.
4. rains A rainy season.
2. A heavy or abundant fall: a rain of fluffy cottonwood seeds; a rain of insults.