seducer vs lady killer

seducer and lady killer both are nouns.

Word	Noun	Adjective	Verb	Adverb
seducer	Yes	No	No	No
lady killer	Yes	No	No	No

As nouns, seducer and lady killer are synonyms defined as:

Other synonyms of seducer include ladies' man.

seducer (noun)	lady killer (noun)
a man who takes advantage of women	a man who takes advantage of women
a bad person who entices others into error or wrongdoing