booklouse vs deathwatch

booklouse and deathwatch both are nouns.

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

As nouns, booklouse and deathwatch are synonyms defined as:

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

Other synonyms of booklouse include book louse, Liposcelis divinatorius.

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