This is the 719th most frequent Croatian word.
stručnjaci
Experts.
'Stručnjace' is in accusative plural form to match the numerals and refer to female experts involved in the activity.
Dvije stručnjace iz te institucije sudjelovale su u projektu.
Two experts from that institution participated in the project.
The word 'stručnjaci' here is used in nominative plural form as the subject of the sentence, referring to individuals with expertise conducting a study.
Stručnjaci su proučavali utjecaj klime na zdravlje.
Experts studied the impact of climate on health.
Here, 'stručnjaci' is again in nominative plural form, indicating the specified group required for the task.