This dataset contains lexical availability data collected from Grade 7 students (experimental group) learning Spanish as a foreign language. The data were elicited through classic centros de interés word-production tasks under time limitations. The unified file includes lexical responses for eight semantic fields:01 – classroom/school objects (pre-test)02 – sports and school subjects (pre-test)03 – body parts (pre-test)04 – family (pre-test)05 – daily actions06 – food and drinks07 – clothing and colours08 – house and furniture. Each row corresponds to one participant, one C.I., and one internal list/trial. Participants have been fully anonymised: original internal codes were replaced with non-identifiable participant IDs (E001, E002, …), and no direct personal identifiers or school-level information are included. This dataset is provided to support transparency, replication, and further research on lexical availability, vocabulary development, and Spanish L2 learning in secondary education.