deathwatch vs deathwatch beetle

deathwatch and deathwatch beetle both are nouns.

Word	Noun	Adjective	Verb	Adverb
deathwatch	Yes	No	No	No
deathwatch beetle	Yes	No	No	No

As nouns, deathwatch and deathwatch beetle are synonyms defined as:

deathwatch and deathwatch beetle: bores through wood making a ticking sound popularly thought to presage death

Other synonyms of deathwatch include Xestobium rufovillosum.

deathwatch (noun)	deathwatch beetle (noun)
bores through wood making a ticking sound popularly thought to presage death	bores through wood making a ticking sound popularly thought to presage death
minute wingless psocopterous insects injurious to books and papers