mastoiditis/mastoyʹdietis/ noun

• hard-hitting
• hardihood
• hard labour
• hard landing
• hard landscape
• hard-line
• hard lines
• hardly
• hard-nosed
• hard of hearing
• hard-on
• hard on/upon
• hard pad
• hard palate
• hardpan
• hard paste
• hard-paste porcelain
• hard-pressed
• hard rock
• hard sauce
• hard science
• hard sell
• hard-shell
• hardship
• hard shoulder