There is a total of 35 clues beginning with h-
- H-"deux"-O
- H-"dos"-O?
- H-1 in HI, eg: Abbr
- H-1B and B-1, for two
- H-bomb bang measure
- H-bomb effects
- H-bomb trial, eg
- H-bomb trial, for one
- H-bomb's raison d'etre
- H-bomb, eg
- H-bombs and the like
- H-bombs, slangily
- H-dos-O
- H-dos-O?
- H-dropper
- H-hour at a newspaper
- H-Hour expression
- H-hour in a Gary Cooper film
- H-hour of D-day
- H-hour relative
- H-hour, theatrically
- H-L connection
- H-L connectors
- H-L fillers
- H-L linkup
- H-like Greek vowel
- H-like letter
- H-like letters
- H-M connection
- H-M links
- H-P printer alternative
- H-shaped Greek letter
- H-shaped letter
- H-shaped letters
- H-___