Peeping Tom vs voyeur

Peeping Tom and voyeur both are nouns.

Word	Noun	Adjective	Verb	Adverb
Peeping Tom	Yes	No	No	No
voyeur	Yes	No	No	No

As nouns, Peeping Tom and voyeur are synonyms defined as:

Peeping Tom and voyeur: a viewer who enjoys seeing the sex acts or sex organs of others

Other synonyms of Peeping Tom include peeper.

Peeping Tom (noun)	voyeur (noun)
a viewer who enjoys seeing the sex acts or sex organs of others	a viewer who enjoys seeing the sex acts or sex organs of others