pair of tweezers vs tweezer

pair of tweezers and tweezer both are nouns.

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

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

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

Other synonyms of pair of tweezers include pair of pincers, pincer.

pair of tweezers (noun)	tweezer (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