roach holder vs pair of pincers

roach holder and pair of pincers both are nouns.

Word	Noun	Adjective	Verb	Adverb
roach holder	Yes	No	No	No
pair of pincers	Yes	No	No	No

As nouns, pair of pincers is a hypernym of roach holder; that is, pair of pincers is a word with a broader meaning than roach holder:

roach holder: metal tweezers used by marijuana smokers to hold a roach
pair of pincers: a hand tool for holding consisting of a compound lever for grasping

Other hypernyms of roach holder include pair of tweezers, pincer, tweezer.

roach holder (noun)	pair of pincers (noun)
metal tweezers used by marijuana smokers to hold a roach	a hand tool for holding consisting of a compound lever for grasping