letch vs perv

letch and perv both are nouns.

Word	Noun	Adjective	Verb	Adverb
letch	Yes	No	No	No
perv	Yes	No	Yes	No

As nouns, perv is a hypernym of letch; that is, perv is a word with a broader meaning than letch:

letch: man with strong sexual desires
perv: a person whose behavior deviates from what is acceptable especially in sexual behavior

Other hypernyms of letch include degenerate, deviant, deviate, perve, pervert.

letch (noun)	perv (noun)
man with strong sexual desires	a person whose behavior deviates from what is acceptable especially in sexual behavior

letch (verb)	perv (verb)
	look at with amorous intentions