- high_handed
- honey_tongued
- hermit
- hay fever
- hay_scented fern
- He
- Hs
- helium
- hassium
- hepatocellular carcinoma
- hepatojugular reflux
- harlot
- houri
- heroine
- hydrargyrum
- Hf
- Hg
- Ho
- heavy metal
- holmium
- hollo
- holler
- hiss
- hem
- hoot
- howl
- honk
- heave
- haw
- humor
- humour
- harp on
- horseshit
- hurl
- hold forth
- heavy
- healthy
- happen upon
- hear
- hymn
- heads up
- hurriedly
- heart and soul
- haymow
- hip_hop
- hawsepipe
- harpoon gun
- harpoon log
- hempen
- hemsman