High-churchman-ship (n.)
definition: The state of being a high-churchman.

High-churchman-ship is a 19 letter word that begins with a H and ends in a P

Historiographership (n.)
definition: The office of an historiographer.

Historiographership is a 19 letter word that begins with a H and ends in a P

Hydrometeorological (a.)
definition: Of or pertaining to hydrometeorology
Or to rain clouds storms etc.
Hydrometeorological is a 19 letter word that begins with a H and ends in an L

Hypocraterimorphous (a.)
definition: Salver-shaped; having a slender tube
Expanding suddenly above into a bowl-shaped or spreading border as in the blossom of the phlox and the lilac.
Hypocraterimorphous is a 19 letter word that begins with a H and ends in an S

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