lecher vs pervert

lecher and pervert both are nouns.

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

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

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

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

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

lecher (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