This paper presents a three-level structuring of multiword terms basing on lexical inclusion, WordNet
similarity and a clustering approach. Term clustering by automatic data analysis methods oers an inter-
esting way of organizing a domains knowledge structure, useful for several information-oriented tasks like
science and technology watch, textmining, computer-assisted ontology population, Question Answering
(QA). This paper explores how this three-level term structuring brings to light the knowledge structures
from a corpus of genomics and compares the mapping of the domain topics against a hand-built ontology
(the GENIA ontology). Ways of integrating the results into a QA system are discussed.