carpet bug vs carpet beetle

carpet bug and carpet beetle both are nouns.

Word	Noun	Adjective	Verb	Adverb
carpet bug	Yes	No	No	No
carpet beetle	Yes	No	No	No

As nouns, carpet bug and carpet beetle are synonyms defined as:

carpet bug and carpet beetle: small beetle whose larvae are household pests feeding on woolen fabrics

carpet bug (noun)	carpet beetle (noun)
small beetle whose larvae are household pests feeding on woolen fabrics	small beetle whose larvae are household pests feeding on woolen fabrics