relation between words called when the meaning of part of the word is alike?

[Kristi]

English Language Tests, Intermediate level

ESL/EFL Test #154 "English grammar and vocabulary questions", question 1

I had to keep my daughter home from school today because she had a ......... of 38 degrees.

(a) fever
(b) headache
(c) temperature
(d) warmth

English Language Tests, Intermediate level

ESL/EFL Test #154 "English grammar and vocabulary questions", answer 1

I had to keep my daughter home from school today because she had a temperature of 38 degrees.

Correct answer: (c) temperature
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how is the relation between one word to another called when the meaning of part of the word is alike? (example rebuild to rephrase) it's not a synonym so what is it?

Kristi

[Yankee]

For example:

The words rebuild and rephrase both have the same prefix (re-).
The words happiness and fairness both have the same suffix (-ness).

Is that what you wanted to know?
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Amy
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ESL teacher, translator, and a native speaker of American English