H
hanged hung
hapax legomenon
haplography
haplology
Harvard comma
Hausa
head
headword
Heavy Metal Umlaut
hendiadys
hendiatris
Henry Watson Fowler
Herbert Coleridge
heteronym
hieronym
High German
historic historical
hoard horde
homeoteleuton (literary)
homeoteleuton (palaeography)
homograph
homonym
homophone
honorific
hybrid
hypallage
hyperbaton
hyperbole
hypercorrect
hyperonym
hyphen (-)
hypocorism
hypocoristic
hyponym
hysterologia
hysteron proteron