| stem | stems | stemmed | stemming | system | systematically |
| farm | farms | farmer | farmed | farming | farmhouse |
| thumb | thumbs | thumbed | thumbing | thumbnail | thumbprint |
| crumb | crumbs | crumble | crumbling | crumbliest | crumblier |
| numb | number | numbers | numbered | numbing | numbness |
| limb | limbs | limbo | climbs | climbing | climbed |
| hammer | hammers | hammered | hammering | jackhammer | sledgehammer |
| shimmer | shimmers | shimmered | shimmery | shimmered | shimmering |
| summer | summers | summertime | summerhouse | summersault | summersaulting |
