There are no rules that can cover all cases of hyphenation. Many hyphenated words are listed in these pages, but it is not within the scope of this book to provide individual entries for all hyphenated words a reporter is likely to use. See Webster's New World College Dictionary for words not listed here.
General guidelines:
1. Compounds not listed separately in the dictionary usually take a hyphen before a noun, but no hyphen after it: A first-quarter touchdown, a touchdown in the first quarter. But never use a hyphen when the compound includes very or an adverb ending in -ly: a very good time, an easily remembered rule.
2. Use a hyphen whenever ambiguity would result if it were omitted: She will speak to small-business men. (The normal spelling is businessmen, but small businessmen is unclear.) Also: He recovered his health. He re-covered the leaky roof.
3. Use a hyphen if a compound modifier -- two or more words that express a single concept -- is listed separately as an adjective with hyphens in Webster's New World. (Example: well-known), the compound is always hyphenated: She is a well-known woman. She is well-known. Also: The child is soft-spoken. The censor is self-appointed. The children are quick-witted.
4 . Some prefixes and suffixes are hyphenated. See prefixes and suffixes.
5. Some numerals, odds, ratios, etc., are hyphenated. See Numerals.
6. Suspensive hyphenation: the 5- and 6-year-olds attend morning sessions.
7. Do not hyphenate common phrases unless they are used as compound modifiers before a noun.
Right: They confronted each other face to face.
Wrong: They confronted each other face-to-face.
Right: It was a face-to-face confrontation.
Some frequently used compounds:
aftereffect
anti-war
backup
biweekly
breakaway (n, adj.),break away (v.)
break-in (n.), break in (v.)
breakout (n), break out (v.)
breakup (n.), break up (v.)
buildup (n.), build up (v.)
byproduct
call-up (n., adj.), call up (v.)
cave-in (n.), cave in (v.)
checkup (n.), check up (v.)
cleanup (n.), cleanup (v.)
close-up (n, adj.), close up (v.)
counterattack
counterespionage
counterintelligence
counterrevolution
counter-terrorism
coverup (n.), cover up (v.)
cutback (n.), cut back (v.)
cutoff (n, adj.), cut off (v.)
die-hard
front-line (adj.), front line (n.)
front-page (adj.), front page (n.)
front-runner
front-running
full-time (adj.), full time (v.)
fundraiser
fundraising (n., adj.)
hard-line (adj.)
hardliner
lineup (n.), line up (v.)
long-term (adj.)
longtime (adj.), long time (n.)
long-shot (adj.), long shot (n.)
makeup (n., adj.), make up (v.)
midafternoon
midair
midmorning
multimillion
multinational
part-time (adj.), part time (v.)
peacekeeper
peacekeeping
peacemaker
postwar
post-World War II
pre-dawn (adj.)
pretrial
prewar
pullback (n., adj.),
pull back (v.)
pushup (n., adj.), push up (v.)
re-elect
rule-making
runoff
runnerup
running mate
rush-hour (adj.), rush hour (n.)
self-defense
semifinal
shake-up (n.), shake up (v.)
short-term (adj.), short term (n.)
speechmaker
speechmaking (adj.)
speechwriter
speedup (n.), speed up (v.)
stand-in (n.), stand in (v.)
standout (n.), stand out (v.)
takeoff (n.), take off (v.)
takeover (n.), take over (v.)
trade-in (n.), trade in (v.)
well-being
well-known
well-to-do
whistle-blower
workout (n.), work out (v.)