Hamper :---> obstruct, impede, hinder.
Harangue :---> long passionate and vehemently speech.
Heap :---> to pile, to gather.
Heterodox :---> unorthodox, heretical
Heterogeneous :---> non-similar things.
Hidebound :---> stubbornness, narrow-mindedness.
Hover :---> hang in the air, float, linger
Hyperbole :---> exaggeration, overstatement.
Hypothetical :---> assumed, theoretical.