Hump
Howitzers were used in the second world war (though they were introduced well before then)
h- harsh h-humble
hydrogen
Cash is a 4 letter word that starts with c and ends with h.
habiter
abolishaccomplishadmonishafterbirthamateurishaftermathanguishapproacharchashastonishattachautographazimuth
heart
hooker
Hail .
hx
hamper
honest