Verbs:
* tend: to care for, to take care of (e.g., tend a garden, tend to a patient)
* attend: to pay attention to, to be present at (e.g., attend a meeting, attend a concert)
* intend: to have in mind as a purpose (e.g., I intend to go to college)
* pretend: to act as if something is true when it is not (e.g., pretend to be asleep)
* extend: to make longer or wider (e.g., extend a hand, extend a deadline)
* contend: to argue or compete (e.g., contend for a prize, contend with difficulties)
* ascend: to move upward (e.g., ascend a mountain)
* descend: to move downward (e.g., descend a staircase)
* transcend: to go beyond the limits of (e.g., transcend expectations)
Nouns:
* tendency: a likelihood to do or act in a particular way (e.g., a tendency to be shy)
* attendance: the act of being present (e.g., the attendance at the concert was high)
* intention: a plan or purpose (e.g., I have no intention of leaving)
Adjectives:
* tendant: related to tending or caring for (e.g., tendant services)
Other:
* tender: (noun) a person who cares for something (e.g., a tender of a garden)
* tender: (adjective) showing gentleness or compassion (e.g., a tender heart)
This list is not exhaustive, but it gives you a good starting point for understanding the versatility of the root word "tend".