The TerMine Plugin uses text mining tools to extract candidate terms from a corpus of text and provides an interface for rapidly bringing these terms into an OWL ontology.
it is a powerful term extraction tool
I suggest adding this tool as a plugin to SDL Trados to prepare projects
you can try it:
http://www.nactem.ac.uk/software/termine/
upload your project as .txt fils ,up to 2MB
analyze it, and get the extracted terms
reference:
API
http://www.nactem.ac.uk/software/termine/webservice/
https://protegewiki.stanford.edu/wiki/TerMine_Plugin
best