In the use of ontologies to address semantic interoperability problems in PLM, either a lexicon or a list of synonyms of the terms in the domain are used to establish semantic mapping. This paper proposes a methodology to establish semantic equivalence of concepts with those in a given ontology based on some textual information about the new concept. This approach involves the classification of the information input into a structure form using natural language processing tools. Aircraft ontology available in literature, is taken as reference domain ontology for this purpose. Text input about the concept is parsed and the parts of speech (POS) tags are analyzed to obtain a structured representation. The structure is then compared to that in the domain ontology to decide if the input concept is part of the reference ontology and if so the concept it is equivalent to is identified. Results from an implementation of this procedure are shown and further work discussed.