wanton vs chat up

wanton is a noun but chat up is not a noun.

Word	Noun	Adjective	Verb	Adverb
wanton	Yes	Yes	Yes	No
chat up	No	No	Yes	No

As verbs, chat up is a hypernym of wanton; that is, chat up is a word with a broader meaning than wanton:

Other hypernyms of wanton include butterfly, coquet, coquette, dally, flirt, mash, philander, romance.

wanton (noun)	chat up (noun)
lewd or lascivious woman

wanton (adjective)	chat up (adjective)
casual and unrestrained in sexual behavior
occurring without motivation or provocation

wanton (verb)	chat up (verb)
behave extremely cruelly and brutally	talk or behave amorously, without serious intentions
engage in amorous play	talk to someone with the aim of persuading him
become extravagant; indulge (oneself) luxuriously
spend wastefully
waste time; spend one's time idly or inefficiently
indulge in a carefree or voluptuous way of life