This study has a twofold purpose. The first and foremost is to see whether there exists any correlation between the collocational knowledge and general linguistic knowledge of EFL learners. The second is to reveal which type(s) of collocation is or are more difficult for EFL learners. To this end, 35 subjects, screened by a proficiency test, were given a 90-item multiple-choice test including lexical collocations ( noun+noun, noun+verb, verb+noun, and adjective+noun ), and grammatical collocations ( noun+preposition and preposition+noun ). A native speaker checked the final version of the data and necessary corrections were made. The results showed that a) there was no significant correlation between general linguistic knowledge and collocational knowledge of EFL learners, and b) the grammatical collocations were more difficult than the lexical collocations for learners and from among all subcategories, noun+preposition was the most difficult and noun+verb was the easiest.