I was once preparing a presentation for english-speaking executives on a factory. I had a slide titled 'Plan of development'. During the review one of the fancy pants corrected me saying that this is incorrect form and I should change it to 'Development plan'.
Same happened several more times, each time they asked to change X of Y
to Y X
.
Part of machinery — Machinery part
Day of May — May day
etc.
The question is: Is there a rule that states which form is correct? And if both forms are acceptable, what's the difference between them?