deathwatch vs booklouse

deathwatch and booklouse both are nouns.

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

As nouns, deathwatch and booklouse are synonyms defined as:

deathwatch and booklouse: minute wingless psocopterous insects injurious to books and papers

Other synonyms of deathwatch include book louse, Liposcelis divinatorius.

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