lech vs pervert

lech and pervert both are nouns.

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

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

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

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

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

lech (verb)	pervert (verb)
	change the inherent purpose or function of something
	practice sophistry; change the meaning of or be vague about in order to mislead or deceive
	corrupt morally or by intemperance or sensuality