Question

sort the words according to the meanings of their shared roots.
tension tense capital
captain cap extension
stretch or strain head

Explanation:

• For the "stretch or strain" group: The root related to stretching is seen in "tension" (state of being stretched), "tense" (stretched or strained), and "extension" (act of stretching out).
• For the "head" group: The root related to head is in "capital" (relating to the head city), "captain" (head of a group), and "cap" (covering the head or being a head-like part).

Answer:

• Stretch or strain: tension, tense, extension
• Head: capital, captain, cap