Words with "tend" as the root:
* attend: to be present at an event
* attend to: to pay attention to something
* extend: to make something longer or wider
* intend: to plan or mean to do something
* pretend: to act as if something is true when it isn't
* suspend: to hang something from above, or to stop something temporarily
Words with "tend" as part of a larger word:
* tender: soft, delicate, or showing compassion
* tendency: a likelihood or inclination to do something
* tendon: a strong fibrous cord that connects muscle to bone
* extender: something that makes something longer
* attendant: someone whose job is to serve or assist others
* intendent: a person who manages or supervises something
These are just a few examples. There are many other words that contain "tend," depending on the specific meaning and context.