1.  seducer(n = noun.person) - a bad person who entices others into error or wrongdoing;
is a kind of bad person
has particulars: seductress
Derived form verb seduce₂

2.  seducer(n = noun.person) ladies' man, lady killer - a man who takes advantage of women;
is a kind of debauchee, libertine, rounder
has particulars: undoer
Derived form verb seduce₁

1.  One who, or that which, seduces. For a female seducer, the term seductress is also used [1913 Webster]
"He whose firm faith no reason could remove,
Will melt before that soft seducer, love." [1913 Webster]

2.  One who induces another to engage in sexual intercourse. [PJC]

N  motive, springs of action, wellsprings of action, reason, ground, call, principle, by end, by purpose, mainspring, primum mobile, keystone, the why and the wherefore, pro and con, reason why, secret motive, arriere pensee, intention, inducement, consideration, attraction, loadstone, magnet, magnetism, magnetic force, allectation, allective, temptation, enticement, agacerie, allurement, witchery, bewitchment, bewitchery, charm, spell, fascination, blandishment, cajolery, seduction, seducement, honeyed words, voice of the tempter, song of the Sirens forbidden fruit, golden apple, persuasibility, persuasibleness, attractability, impressibility, susceptibility, softness, persuasiveness, attractiveness, tantalization, influence, prompting, dictate, instance, impulse, impulsion, incitement, incitation, press, instigation, provocation, inspiration, persuasion, suasion, encouragement, advocacy, exhortation, advice, solicitation, lobbyism, pull, incentive, stimulus, spur, fillip, whip, goad, ankus, rowel, provocative, whet, dram, bribe, lure, decoy, decoy duck, bait, trail of a red herring, bribery and corruption, sop, sop for Cerberus, prompter, tempter, seducer, seductor, instigator, firebrand, incendiary, Siren, Circe, agent provocateur, lobbyist, impulsive, motive, suasive, suasory, persuasive, persuasory, hortative, hortatory, protreptical, inviting, tempting suasive, suasory, seductive, attractive, fascinating, provocative, induced, disposed, persuadable, spellbound, instinct with, smitten with, infatuated, inspired, by, because, therefore, from this motive, from that motive, for this reason, for that reason, for, by reason of, for the sake of, count of, out of, from, as, forasmuch as, for all the world, on principle, fax mentis incendium gloriae, temptation hath a music for all ears, to beguile many and be beguiled by one.

N  libertine, voluptuary, rake, debauchee, loose fish, rip, rakehell, fast man, intrigant, gallant, seducer, fornicator, lecher, satyr, goat, whoremonger, paillard, adulterer, gay deceiver, Lothario, Don Juan, Bluebeard, chartered libertine, adulteress, advoutress, courtesan, prostitute, strumpet, harlot, whore, punk, fille de joie, woman, woman of the town, streetwalker, Cyprian, miss, piece, frail sisterhood, demirep, wench, trollop, trull, baggage, hussy, drab, bitch, jade, skit, rig, quean, mopsy, slut, minx, harridan, unfortunate, unfortunate female, unfortunate woman, woman of easy virtue, wanton, fornicatress, Jezebel, Messalina, Delilah, Thais, Phryne, Aspasia, Lais, lorette, cocotte, petite dame, grisette, demimonde, chippy, sapphist, spiritual wife, white slave, concubine, mistress, doxy, chere amie, bona roba, pimp, procurer, pander, pandar, bawd, conciliatrix, procuress, mackerel, wittol.