Generally speaking the starting letter of your noc code helps with that. For e.g. NOC code of 0xxx, means some management role, NOC A is for professional fields such as engineering and NOC B is for technical / roles that require a specific skills.
Details can be read from following thread
http://www.canadavisa.com/canada-immigration-discussion-board/list-of-noc-skills-level-0-a-and-b-t24274.0.html
as well as the official links
http://www.hrsdc.gc.ca/eng/jobs/lmi/noc/index.shtml
But you have to read details to understand exactly. However, i wonder why not simply googling the NOC code with strings like
"Is NOC xxxx skilled job" etc. would do.