dagger vs dirk

dagger and dirk both are nouns.

Word	Noun	Adjective	Verb	Adverb
dagger	Yes	No	No	No
dirk	Yes	No	No	No

As nouns, dirk is a hyponym of dagger; that is, dirk is a word with a more specific, narrower meaning than dagger:

Other hyponyms of dagger include kirpan, crease, creese, kris, bodkin, poniard, stiletto.

dagger (noun)	dirk (noun)
a short knife with a pointed blade used for piercing or stabbing	a relatively long dagger with a straight blade
a character used in printing to indicate a second cross reference or footnote when the asterisk has already been used