Was heißt »Grundwort« auf Englisch?

Das Substantiv Grundwort lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Synonyme

Imagination is the root of all civilization.
We learned at school that the square root of nine is three.
The root of the problem is a lack of communication between departments.
Two is the fourth root of sixteen.
These words are derived from the same root.
Money is the root of all evil.
I always root for the underdog.
The lack of money is the root of all evil.
Poverty is the root of all evil.
What's the square root of 100?
The teacher asked him, "What's the square root of 256?"
The student answered, "The square root of 256 is sixteen."
Do you like root beer?
Tom told me that he often drinks root beer, but he'd not only never drunk spruce beer, he'd never even heard of it.
For the love of money is the root of all evil: which while some coveted after, they have erred from the faith, and pierced themselves through with many sorrows.
The square root of one hundred forty-four is twelve.
The cube root of twenty-seven is three.
The root cause of any divorce is marriage.
In itself idleness is not the root of all evil. Quite the opposite, in fact, it’s a downright godly existence, as long as one isn’t bored.
Love of money is the root of all evil.