Answer:

小児性愛者” /shō ni sei ai sha/: “PEDOPHILIA”

Let break it down,

“小” /shō/ (“small, little”) +‎ “児” /ni/ (“child”; “INFANT”) = “young child”; “infant”

“性” /sei/ (“nature”; SUFFIX to “-ness”, “-ity”) “愛” /ai/ (“love”; “AFFECTION”) = “érōs” (Greek: “love/ sexual DESIRE”)

“者” /-sha/ (“someone of that type, someone who does that”)

“小児” /shō ni/ (“young child”; “infant”) + “性愛” /sei ai/ (“love/ sexual desire”) + “者” /sha/ (“someone of that type, someone who does that”)

So “someone who has a loving/ sexual desire for young child(ren) is a “pedophile” or “child molester”

ロリコン /RO RI KO N/: The way it's sound, (informal) “Lolicon”.

Lolicon: “sexual attraction to young girls” and “one who is sexually attracted to young girls”.

Originated word and Wasei-eigo (“Japanese-made English”): “ロリータ・コンプレックス” /RO RĪ TA・KO M PU REKKU SU/ (“Lolita complex”), from the Vladimir Nabokov novel “Lolita”, and English “complex” such as the famous Greek tragedy-genre threatrical play, “Oedipus complex”.

Overall, both are similar meanings. One is refers to “young child(ren), both boy(s) and girl(s)” while the other refers to mostly “young girl(s)”.

Explanation:

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