Jack Miller certainly did write for House of Mystery when it carried Dial H, but he wrote the Martian Manhunter stories. He and Dave Wood share some ways of writing—both use "Great ghosts" and Tense moments later..., but they differ in other ways. Where Wood uses "O-oh," Miller makes use of "Oh-h-h-h." The first Dial H story, among others, has a couple of instances of Wood's pausing after a first word: "I'm...back to normal again!" and "He's...entering an escape hatch of some kind!"
The two Otto Binder stories contain his old standby "Ulps." The Bill Finger story uses "Wha-aat." The Dick Wood stories boast "Great suffering cats" and "Howling horrors." Since these are the only stories of his I've seen for DC at this time—he had moved over to Gold Key, King, and Harvey—I wonder if he ghosted them for his brother Dave.
And I believe the final Dial H for Hero story is another example of Charles Nicholas' ghost pencilling for Sal Trapani. The pose of the policeman in the middle panel is typical Nicholas.
Dial H for Hero in House of Mystery
|Jan/66||#156||Dial H for Hero||w: Dave Wood a: Jim Mooney|
|Mar/||#157||The Marauders from Thunderbolt Island||w: Dave Wood a: Mooney|
|Apr/||#158||Dial V for Villain||w: Dave Wood a: Mooney|
|June/||#159||The Clay-Creep Clan||w: Dave Wood a: Mooney|
|July/||#160||The Wizard of Light||w: Dave Wood a: Mooney|
|Sept/||#161||The Mummy with Six Heads||w: Dave Wood a: Mooney|
|Oct/||#162||The Monster-Maker of Littleville||w: Bill Finger a: Mooney|
|Dec/||#163||Baron Bug and His Insect Army||w: Dave Wood a: Mooney|
|Jan/67||#164||Dr. Cyclops—the Villain with the Doomsday Stare||w: Dave Wood a: Mooney|
|Mar/||#165||The Freak Super-Heroes||w: Dave Wood p: Mooney i: George Roussos|
|Apr/||#166||The King of the Curses||w: Dave Wood p: Mooney i: Roussos|
|June/||#167||The Fantastic Rainbow Raider||w: Otto Binder p: Mooney i: Roussos|
|July/||#168||The Marauding Moon Man||w: Dave Wood p: Mooney i: Roussos|
|Sept/||#169||The Terrible Toymaster||w: Binder a: Mooney|
|Oct/||#170||Thunderbolt's Secret Weapon||w: Dave Wood a: Mooney|
|Dec/||#171||The Micro-Monsters||w: Dick Wood a: Frank Springer|
|Feb/68||#172||The Monsters from the H-Dial||w: Dick Wood a: Springer|
|Apr/||#173||Revolt of the H-Dial||w: Dave Wood p: Charles Nicholas i: Sal Trapani|
Covers by Jim Mooney except #163: Carmine Infantino/Joe Giella; 171: Nick Cardy; 172: Frank Springer; and 173: Jack Sparling.