lech vs perv

lech and perv both are nouns.

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

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

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

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

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

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