pervert vs lech

pervert and lech both are nouns.

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

As nouns, lech is a hyponym of pervert; that is, lech is a word with a more specific, narrower meaning than pervert:

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

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

pervert (verb)	lech (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