Come over this nice definitions of Richard Hundhausen about that terminology in SCRUM and TFS. Which I found very useful, so maybe you like to check that out as well?
Scrum Concept
Visual Studio Concept
Team
Team Foundation Server security groups
Definition of Done
Wiki entry or document on the portal
Product
Team Project
Product Backlog
Product Backlog shared query or Backlog page on TWA
Product Backlog Item
PBI or Bug work item
Acceptance Criteria
Acceptance Criteria field and (optionally) associated Test Case work item(s)
Release
Iteration Path (high level)
Release Plan
Backlog page on Team Web Access (w/ Forecast tool)
Sprint
Iteration Path (low level)
Sprint Dates
Iteration start and end dates
Sprint Goal
Sprint Backlog
Sprint Backlog shared query or Backlog & Board pages on TWA
Task
Task work item
Burndown and Velocity
Release Burndown, Sprint Burndown, and Velocity reports and charts on TWA
Impediment
Impediment work item
Retrospective