If theres a question like "comment on the language used in this extract "(or in poetry, fiction, or drama; both studied and unseen) what should i talk about?
Well.... they tend to refer 'language used in this extract' as being frequently used in poetry, but they can occasionally be used in fiction and drama.
In poetry, they mean the poetic devices e.g. alliteration, tone, oxymoron etc.
For the others this also applies but to a lesser extent. The most you could go on would be the choice of noun, adjective etc. But you could still talk about poetic devices within the extract.