Hood, Hooligan, Heartbreaker. Hellish, Hardhearted, and that is off the top of my head. Keep looking back, I know some people who just might add to this.
Ham.
Hubble telescope is a space word. It begins with the letter h.
Haughty is another word for arrogant that begins with the letter H.
Hexagon (:
habitation
happen
Hazel Hockey
hair
Half
haughty
halogenheliumhydrogen
Some words that start and end with letter H are:harshhashhashishhatchhathheathhighhitchhoochhurrahhushhutch