Non-standard speech and Spoken language

Non-standard speech noun - Speech that differs from the usual accepted, easily recognizable speech of native adult members of a speech community.

Spoken language and non-standard speech are semantically related. In some cases you can use "Spoken language" instead a noun phrase "Non-standard speech".

Spoken language noun - (language) communication by word of mouth.

Non-standard speech and spoken language are semantically related. Sometimes you can replace phrase "Non-standard speech" with "Spoken language", this phrases are similar.