To help students develop their subject specific vocabulary asks students to make their own personal glossary in the back of their books. Initially you can direct them to enter keywords but over time they should take ownership of it and add words when they need to. For your SEN students you could provide some printed keywords at the start of a new topic and they could highlight them when they become relevant. To stretch more able students give them more complex terms that they could research.
I use this for all of my classes so any questions drop me an email. Lottie