swim + er
swimmer
drop + er
dropper
Slip + ing
Slipping
blink + er
blinker
trim + ed
trimmed
crop + ed
cropped
chunk + ing
chunking
spam + ed
spammed
grab + ed
grabbed
bolt + ed
bolted
bridge + ing
bridging
tan + er
tanner
stop + ed
stopped
fat + est
fattest
sled + ing
sledding
hitch + ing
hitching
drum + er
drummer
fetch + ed
fetched
flip + ing
flipping
grill + ing
grilling