Caterpillar and Measuring worm

Caterpillar noun - A large tracked vehicle that is propelled by two endless metal belts; frequently used for moving earth in construction and farm work.

Measuring worm and caterpillar are semantically related. In some cases you can replace phrase "Measuring worm" with "Caterpillar", this terms are similar.

Measuring worm noun - Small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae.

Caterpillar and measuring worm are semantically related. You can use "Caterpillar" instead a noun phrase "Measuring worm".