This paper presents the findings of a study that analyzed the use of lexical bundles in two registers of research articles: education and geology. The corpus (Ant Conk) consisted of education articles, and geology articles. The most frequent four-word combinations were selected as lexical bundles and classified functionally in each register. The analyses showed that the bundles identified in each discipline are different to some extent. Finally, a functional classification showed that some bundles in both disciplines shared functions connected to the specific sub- function, while some of them are connected to the register’s interest.