tweezer vs pair of tweezers

tweezer and pair of tweezers both are nouns.

Word	Noun	Adjective	Verb	Adverb
tweezer	Yes	No	No	No
pair of tweezers	Yes	No	No	No

As nouns, tweezer and pair of tweezers are synonyms defined as:

tweezer and pair of tweezers: a hand tool for holding consisting of a compound lever for grasping

Other synonyms of tweezer include pair of pincers, pincer.

tweezer (noun)	pair of tweezers (noun)
a hand tool for holding consisting of a compound lever for grasping	a hand tool for holding consisting of a compound lever for grasping