Heavy Machinery

noun a wormlike larva of a butterfly or moth, having numerous pairs of legs

• The caterpillar is a larval stage in the life cycle of a butterfly or moth.
• I found a cute little caterpillar crawling on the tree outside.
• That caterpillar looks like a tiny noodle with legs!
• His business started as a small caterpillar but soon grew into a thriving butterfly.

noun a type of durable stone used in construction

adjective describing something as tough or unyielding

• The geologist identified the formation as hard rock, composed mainly of granite.
• I love listening to hard rock music, it always pumps me up.
• That new band plays some sick hard rock tunes.
• Dealing with the difficult situation was like trying to break through a wall of hard rock.