| night | nights | nightmare | midnight | nightlight |
| knight | knights | knighted | knighting | knighthood |
| knack | knacks | knacker | knackered | knickknack |
| gnaw | gnaws | gnawed | gnawing | gnawer |
| gnarl | gnarls | gnarly | gnarled | gnarling |
| align | aligns | aligning | aligned | alignment |
| pneumonia | pneumonia | pneumonia | pneumonia | pneumonia |
| pneumatic | pneumatic | pneumatic | pneumatic | pneumatic |
