They used a secret language understood only among themselves.
The police tried to decipher the cant used by the criminal.
They used jargon that only their group understood.
In that group, the police are called "satsu" in their slang.
専門用語 is technical terminology used openly within a field, whereas 隠語 often carries a nuance of secrecy or exclusion of outsiders.
業界用語 is industry-specific jargon that insiders use for convenience, while 隠語 stresses concealing meaning from non-members.
スラング is casual, trendy slang used broadly among peers, whereas 隠語 is coded vocabulary meant to keep outsiders from understanding.
隠語 clearly means secret or in-group jargon, whereas カント is an obscure term that may cover this sense but is far less transparent to Japanese readers.
暗号 is a cipher or code that encrypts a message's form, while 隠語 is ordinary-sounding vocabulary whose special meaning is known only to a group.
Standard kanji spelling; the most common written form.
Search-only variant; not a standard spelling.
Compound of 隠 (in, 'hidden') and 語 (go, 'word, language'). The spelling directly reflects the meaning of concealed speech.
"Hoshi" is police jargon referring to the suspect.