1) Caterpillar 1) Vetch worm 
A bollworm is a common term for any larva of a moth that attacks the fruiting bodies of certain crops, especially cotton. The most common moths known as bollworms are: == See also == ...
• (n.) The larva of a moth (Heliothis armigera) which devours the bolls or unripe pods of the cotton plant, often doing great damage to the crops.
any larva of various moths (order Lepidoptera), including the pink bollworm of the family Gelechiidae (see gelechiid moth) and some Heliothis ... [2 related articles]
Boll'worm` noun (Zoology) The larva of a moth ( Heliothis armigera ) which devours the bolls or unripe pods of the cotton plant, often doing great damage to the crops. 
[n] - any of various moth caterpillars that destroy cotton bolls
noun any of various moth caterpillars that destroy cotton bolls