pincer vs pair of pincers

pincer and pair of pincers both are nouns.

Word	Noun	Adjective	Verb	Adverb
pincer	Yes	No	No	No
pair of pincers	Yes	No	No	No

As nouns, pincer and pair of pincers are synonyms defined as:

pincer and pair of pincers: a hand tool for holding consisting of a compound lever for grasping

Other synonyms of pincer include pair of tweezers, tweezer.

pincer (noun)	pair of pincers (noun)
a grasping structure on the limb of a crustacean or other arthropods	a hand tool for holding consisting of a compound lever for grasping
a hand tool for holding consisting of a compound lever for grasping