voyeur vs Peeping Tom

voyeur and Peeping Tom both are nouns.

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

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

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

Other synonyms of voyeur include peeper.

voyeur (noun)	Peeping Tom (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