Web Analytics is:
"...the collection, reporting, and analysis of website data. The focus is on identifying measures based on your organizational and user goals and using the website data to determine the success or failure of those goals and to drive strategy and imprive the user's experience."
"Web Analytics Basics". From http://www.usability.gov/what-and-why/web-analytics.html
"...a method used to generate information about the associations and grouping of specific data items. Partipants in a card sort are asked to organize individual, unsorted items into groups and may...also provide labels for these groups."
"Card Sorting". From http://usabilitybok.org/card-sorting
Heuristic Evaluation is:
"...a usability evaluation method in which one or more reviewers, preferably experts, compare a software, documentation, or hardware product to a list of design principles and identify where the product does not follow those principles."
"Heuristic Evaluation". From http://usabilitybok.org/heuristic-evaluation
"...is a structure questionnaire that your target audience completes over the internet generally through filling out a form...the survey tool generally provides some level of analysis of the data in addition to review by a trained expert."
"Online Surveys". From http://www.usability.gov/how-to-and-tools/methods/online-surveys.html