caterpillar /katˈər-pi-lər/

1. A butterfly or moth grub
2. Extended to other insect larvae
3. An unproductive consumer (archaic)
4. (Caterpillar®) a tractor or other (esp earthmoving) vehicle running on endless articulated tracks made up of a series of flat metal plates

• ballad concerts
• ballade
• balladed
• balladeer
• balladeers
• ballade royal
• ballades
• balladin
• balladine
• ballading
• balladist
• balladists
• ballad metre
• balladmonger
• balladmongers
• ballad opera
• ballad operas
• balladries
• balladry
• ballads
• ballan
• ball and chain
• ball-and-claw
• ball-and-socket joint
• ballans