In the last years, research on onthologies has received much attention because of the possibilities it offers regarding information organization. During the onthology development process, the phase of conceptualization deserves special attention on account of its importance and complexity. This paper investigates possible improvements in the phase of conceptualization, relying on linguistics theories to verify variations of semantic relations among terms. We present a proposal including: i) a linguistic-based schema which identifies semantic relations in texts; ii) the use of an automatic tool which extracts terms from medical texts; iii) an assessment conducted with physicians requesting which relations are more appropriate. We investigate the possibility of significant variations in the semantic of those relations, the impact of such variation on the development of onthologies and the validity of the obtained relations. We hope to offer new possibilities regarding the construction of information organization instruments, as well as providing alternatives to involved professionals.