wording

Author: PatrickFarley

articles/cognitive-services/Face/Face-API-How-to-Topics/how-to-use-headpose.md

@@ -120,7 +120,7 @@ From here, you can use the returned **Face** objects in your display. The follow
 
 You can detect head gestures like nodding and head shaking by tracking HeadPose changes in real time. You can use this feature as a custom liveness detector.
 
-Liveness detection is the practice of determining that a subject is a real person and not an image or video representation. A head gesture detector could serve as one way to help verify liveness, especially as opposed to an image representation of a person.
+Liveness detection is the task of determining that a subject is a real person and not an image or video representation. A head gesture detector could serve as one way to help verify liveness, especially as opposed to an image representation of a person.
 
 > [!CAUTION]
 > To detect head gestures in real time, you'll need to call the Face API at a high rate (more than once per second). If you have a free-tier (f0) subscription, this will not be possible. If you have a paid-tier subscription, make sure you've calculated the costs of making rapid API calls for head gesture detection.